Warm-glow giving
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Warm-glow giving is an economic theory describing the emotional reward of giving to others. According to the original warm-glow model developed by James Andreoni (1989, 1990), people experience a sense of joy and satisfaction for "doing their part" to help others. This satisfaction - or "''warm glow"'' - represents the selfish pleasure derived from "doing good", regardless of the actual impact of one's generosity. Within the warm-glow framework, people may be "impurely altruistic", meaning they simultaneously maintain both altruistic and egoistic (selfish) motivations for giving. This may be partially due to the fact that "warm glow" sometimes gives people credit for the contributions they make, such as a plaque with their name or a system where they can make donations publicly so other people know the “good” they are doing for the community. Whereas "pure altruists" (sometimes referred to as "perfect altruists") are motivated solely by the desire to provide for a recipient, impure altruists are also motivated by the joy of giving (warm glow). Importantly, warm glow is distinctly non-pecuniary, meaning it arises independent of the possibility of financial reward. Therefore, the warm glow phenomenon is distinct from
reciprocal altruism In evolutionary biology, reciprocal altruism is a behaviour whereby an organism acts in a manner that temporarily reduces its fitness while increasing another organism's fitness, with the expectation that the other organism will act in a similar m ...
, which may imply a direct financial incentive. Warm-glow giving is a useful economic framework to consider public good provision, collective action problems, charitable giving, and gifting behavior. The existence of a warm glow helps explain the absence of complete crowding-out of private giving by public grants, as predicted by classical economic models under the neutrality hypothesis. Beyond economics, warm glow has been applied to sociology, political science, environmental policy, healthcare, and business. Conceptually, warm-glow giving is related to the notion of a "helper's high" and appears to be resilient across cultures.


Background in moral philosophy

Warm glow is built upon the idea of impure altruism: the blend of both altruistic and egoistic desires to help others. Philosophers have debated this idea since the time of the ancient Greeks. In the Socratic ''dialogues'', motivation may be traced to an egoistic concern for one's own welfare, thus denying the plausibility of pure altruism. Similarly,
Plato Plato ( ; grc-gre, Πλάτων ; 428/427 or 424/423 – 348/347 BC) was a Greek philosopher born in Athens during the Classical period in Ancient Greece. He founded the Platonist school of thought and the Academy, the first institution ...
's organization of motivations as responses to hunger-based desires highlights the foundational importance of egoism in all social interactions. However, in Nicomachean Ethics and
Eudemian Ethics The ''Eudemian Ethics'' ( el, Ἠθικὰ Εὐδήμεια; la, Ethica Eudemia or ''De moribus ad Eudemum'') is a work of philosophy by Aristotle. Its primary focus is on ethics, making it one of the primary sources available for study of Ari ...
, Aristotle considers both the possibility and necessity of altruism to fulfill high-order eudaimonic goals, thus setting the stage for an ongoing philosophical debate.
Hobbes Thomas Hobbes ( ; 5/15 April 1588 – 4/14 December 1679) was an English philosopher, considered to be one of the founders of modern political philosophy. Hobbes is best known for his 1651 book ''Leviathan'', in which he expounds an influe ...
,
Kant Immanuel Kant (, , ; 22 April 1724 – 12 February 1804) was a German philosopher and one of the central Enlightenment thinkers. Born in Königsberg, Kant's comprehensive and systematic works in epistemology, metaphysics, ethics, and aest ...
,
Nietzsche Friedrich Wilhelm Nietzsche (; or ; 15 October 1844 – 25 August 1900) was a German philosopher, prose poet, cultural critic, philologist, and composer whose work has exerted a profound influence on contemporary philosophy. He began his car ...
, Bentham, J.S. Mill argued against the possibility of pure altruism and advanced the doctrine of
psychological egoism Psychological egoism is the view that humans are always motivated by self-interest and selfishness, even in what seem to be acts of altruism. It claims that, when people choose to help others, they do so ultimately because of the personal benefi ...
, while others ( Butler, Hume,
Rousseau Jean-Jacques Rousseau (, ; 28 June 1712 – 2 July 1778) was a Genevan philosopher, writer, and composer. His political philosophy influenced the progress of the Age of Enlightenment throughout Europe, as well as aspects of the French Revolu ...
, Adam Smith, Nagel) argued for the existence of altruistic motives. Conceptually, the warm-glow model represents a stylized compromise between these two perspectives, allowing for individuals to be purely altruistic, purely egoistic, or impurely altruistic. Warm glow is at least tangentially related to the topic of
free will Free will is the capacity of agents to choose between different possible courses of action unimpeded. Free will is closely linked to the concepts of moral responsibility, praise, culpability, sin, and other judgements which apply only to ac ...
, as people should only reap the psychological reward of helping if they freely choose to do so.


Background in economics


Departure from Classical theory

The normative theory of
Ricardian equivalence The Ricardian equivalence proposition (also known as the Ricardo–de Viti–Barro equivalence theorem) is an economic hypothesis holding that consumers are forward-looking and so internalize the government's budget constraint when making their co ...
suggests private spending should be unresponsive to
fiscal policy In economics and political science, fiscal policy is the use of government revenue collection (taxes or tax cuts) and expenditure to influence a country's economy. The use of government revenue expenditures to influence macroeconomic variab ...
because forward-looking individuals smooth their consumption, consistent with Modigliani's
life-cycle hypothesis In economics, the life-cycle hypothesis (LCH) is a model that strives to explain the consumption patterns of individuals. Background The hypothesis Implications Saving and wealth when income and population are stable The effect of population ...
. Applied to the provision of charities or public goods, Ricardian equivalence and the classical assumption of pure altruism together support the neutrality hypothesis, implying perfect substitutability between private and public contributions. The neutrality hypothesis assumes rational economic agents are indifferent to whether a cause is funded by the private or public sector; only the level of funding is relevant. A consequence of neutrality under perfect altruism is that government grants should completely crowd-out private donations. That is, a dollar given by the government takes the place of a dollar that would have been given by a private citizen. To illustrate, economic agents operating under the neutrality hypothesis would give to a cause until complete provision, beyond which they would contribute nothing. This is consistent with Andreoni's conceptualization of "pure altruism"; however, it is inconsistent with impure altruism or pure egoism. Thus, warm glow and the failure to act as purely altruistic present fundamental challenges to the neutrality hypothesis and Ricardian equivalence. In economics, violations to the neutrality hypothesis pose serious concerns for macroeconomic policies involving taxation and redistribution; and microeconomic theories for collective action and public good provision. Several of Andreoni's contemporaries simultaneously provided evidence against neutrality-driven crowding-out effects, including Kingma (1989) and Khanna et al. (1995). Taken together, these findings offered a strong rebuke of the assumption that public grants crowd-out private donations to public goods.


Original model

Andreoni's economic model of impure altruism considers a simplistic world with only two goods: a
private good A private good is defined in economics as "an item that yields positive benefits to people" that is excludable, i.e. its owners can exercise private property rights, preventing those who have not paid for it from using the good or consuming its ...
and a public good. A given individual, endowed with wealth (w_),faces the budget constraint: w_ = x_ + g_, where x_ represents consumption of a private good, and g_represents the contribution to the public good. To the extent that g_i positively contributes to
utility As a topic of economics, utility is used to model worth or value. Its usage has evolved significantly over time. The term was introduced initially as a measure of pleasure or happiness as part of the theory of utilitarianism by moral philosoph ...
, it may be interpreted as the degree of warm glow. It follows that the total provision of the public good, G, is simply: \sum_^ (g_),and the total contributions to the public good from all other individuals is denoted as: G_ = \sum_^n(g_).Thus, the public good is the sum of the i^ person's contribution (g_),along with the total contributions of all other individuals G_. (1) G = g_ + G_,where g_i \ge 0. All individuals in this naïve economy face the same
utility function As a topic of economics, utility is used to model worth or value. Its usage has evolved significantly over time. The term was introduced initially as a measure of pleasure or happiness as part of the theory of utilitarianism by moral philosoph ...
s, given by: (2)U_ = U_(x_,G,g_), where the utility functions represent the utility for private, egoistic consumption U_(x_);the utility derived from the public good U_(G);and the warm-glow utility of the contribution towards the public good U_(g_).An altruist should derive no additional utility from the act of giving: U_ = f(x_i, G),whereas a pure egoist derives pleasure only from the warm glow of giving, without care for the public good itself, hence U_ = f(x_i,g_i). From the budget constraint and utility function, one can derive the utility maximization function, max U_(w_+G_-G, G, G - G_),which is the original utility function (2) transformed using the definition of the public good (1). This utility maximization function serves as the foundation for warm-glow model development


Implications

Assuming a strategy of utility maximization, the model of warm glow offers many important economic predictions. Specifically, it presents three contrarian insights to those of classical economics under Ricardian equivalence. First, warm-glow theory predicts that income transfers will increase net giving only when income is transferred to more altruistic individuals. Second, it suggests that the provision of a public good is dependent upon the distribution of income within a population. Third, it suggests that public fund of public goods through lump-sum taxes will be more effective than relying upon altruism in the private sector. Individually and collectively, these propositions are in stark contrast to the
laissez-faire ''Laissez-faire'' ( ; from french: laissez faire , ) is an economic system in which transactions between private groups of people are free from any form of economic interventionism (such as subsidies) deriving from special interest groups ...
doctrine of Ricardian economics. Following this original model, warm glow has conceptually evolved with new applications across disciplines to explain and encourage
prosocial behavior Prosocial behavior, or intent to benefit others, is a social behavior that "benefit other people or society as a whole", "such as helping, sharing, donating, co-operating, and volunteering". Obeying the rules and conforming to socially accepted beh ...
.


Background in psychology

Many of the advances in warm glow research stem not from economics, but from psychology. In particular, research on motivations and affect have played a key role in defining and operationalizing warm glow for broad application.


A motivational perspective

''"...a millionaire does not really care whether his money does good or not, provided he finds his conscience eased and his social status improved by giving it away..." -George Bernard Shaw.'' As illustrated in Shaw's quote, both intrinsic desires of conscience and extrinsic desires of social status may motivate giving. Warm glow has traditionally been restricted to intrinsic motivation, however this distinction is often murky. There has been considerable inconsistency in the literature as to whether a warm glow refers to
intrinsic In science and engineering, an intrinsic property is a property of a specified subject that exists itself or within the subject. An extrinsic property is not essential or inherent to the subject that is being characterized. For example, mass ...
or
extrinsic In science and engineering, an intrinsic property is a property of a specified subject that exists itself or within the subject. An extrinsic property is not essential or inherent to the subject that is being characterized. For example, mass ...
motivation. According to Andreoni (2006), "putting warm-glow into the model is, while intuitively appealing, an admittedly ''ad hoc'' fix". Further elaborating on the topic, he and colleagues wrote that the concept was "originally a placeholder for more specific models of individual and social motivations". From this initial ambiguity, different authors have at times referred to the phenomenon as solely intrinsic, both intrinsic and extrinsic, or solely extrinsic. Some authors have made deliberate distinctions between prestige-seeking (extrinsic) and the intrinsic components of warm glow, but many have not. Conceptualization of warm glow as either intrinsic or extrinsic has implications for motivational crowding out, satiation effects, and expected magnitude.


Intrinsic warm glow

The most common and classically "correct" interpretation of warm glow is as a solely intrinsic phenomenon. Language referring to the "joy of giving", "the positive emotional experience from the act of helping others", "the moral satisfaction of helping others" and the "internal satisfaction of giving" suggests an intrinsic drive. The intrinsic component of warm glow is the private emotional benefit to giving.


Extrinsic warm glow

Much of the ambiguity surrounding the motivational processes of warm glow has arisen from the misclassification of extrinsic rewards to intrinsic processes. While intrinsic desires center upon emotional gains, extrinsic rewards may include recognition, identity signaling, and prestige. Extrinsic motivation may also take the form of punishment (negative warm glow), in the form of censure or blame. Some research has explicitly focused on extrinsic warm glow, such as "relational warm glow". One area that has been frequently confused in the literature involves the classification of guilt, which is an introjected form of extrinsic motivation.


Importance of motivational classification

The classification of warm glow as either intrinsic or extrinsic has important ramifications for policy makers. The extensive body of literature on motivational crowding out suggests the efficacy of policies promoting altruistic behavior may be a function of whether pre-existing behavior is intrinsically or extrinsically motivated. The extent to which extrinsic incentives may be substitutes for intrinsic motivations depends upon the motivational classification of the warm glow model. Furthermore, intrinsic warm glow may be more resilient to satiation effects than extrinsic warm glow. Finally, the expected magnitude of a warm glow will be a function of how it is characterized. Models assuming a purely intrinsic warm glow should report lesser warm glows than models also including extrinsic components.


Empathy and the psychological determinants of warm glow

The phenomenon of warm-glow giving was originally introduced as an economic model. It its original form, the warm-glow model lacked a satisfactory explanation for the underlying psychological processes. Early studies of warm glow were deliberately vague in attributing the experience to a cause. A more recent body of research has identified several important determinants of warm glow, including social distance, vividness to the beneficiary, and guilt avoidance. Taken together, these observations suggest the warm glow may be best described as the visceral manifestation of
empathy Empathy is the capacity to understand or feel what another person is experiencing from within their frame of reference, that is, the capacity to place oneself in another's position. Definitions of empathy encompass a broad range of social, co ...
. This is consistent with the moral psychological literature of empathy, most notably as advanced by Batson. In his "empathy-altruism hypothesis", Batson claims that empathy ("feeling sympathetic, compassionate, warm, softhearted, tender") evokes a desire for other-regarding behavior.


Social distance

Social distance In sociology, social distance describes the distance between individuals or social groups in society, including dimensions such as social class, race/ethnicity, gender or sexuality. Members of different groups mix less than members of the same g ...
is an important determinant of warm glow, particularly in the framework of empathy. Prior research has examined the link between emotional arousal and social distance, finding that mutual suffering and shared joy both increase as a function of social similarity. Consistent with the " identifiable victim effect", research has shown that people express a greater willingness to help when others are known, as opposed to statistical.


Vividness to beneficiary

While the vividness of the beneficiary is captured in social distance, the vividness to the beneficiary refers to a beneficiary's ability to perceive that kindness has been done upon them. As a determinant of warm glow, vividness to the beneficiary operates on two levels. The primary level concerns whether a beneficiary is aware that kindness has been given to them, absent any attribution of the source. The secondary level involves the identifiability of the benefactor. Warm glow should be positively impacted by both levels for vividness.


Guilt

Recent work has identified guilt avoidance as an important component of warm glow. Some have even compared guilt as the "flip side" of warm glow. Parameterizing guilt as a component of warm glow allows for deficit values of warm glow, which was originally constrained to strictly positive values in Andreoni (1989, 1990). In a recent publication, Andreoni and colleagues explain this by writing: ''"Psychologists posit that giving is initiated by a stimulus that elevates sympathy or empathy in the mind of the potential giver, much as the smell of freshly baked bread can pique appetite. Resolving this feeling comes either by giving and feeling good or by not giving and feeling guilt."'' In other notable overviews of warm glow, this phenomenon has been characterized as "personal distress". In surveys of self-reported guilt, people experience roughly as much interpersonal and societal guilt as they do personal guilt. Furthermore, half of the survey respondents prefer to directly address and resolve their feelings of guilt. Taken together, these findings suggest a substantial component of guilt aversion.


Neurobiological evidence

Evidence from neural imaging supports the warm-glow effect. A meta-analysis of 36 studies using functional magnetic resonance imaging demonstrated that the brain's reward networks are consistently activated when choices to give are made. This includes the ventromedial prefrontal cortex (vmPFC). Strategic decisions for which something is hoped for in return activate more anterior regions of vmPFC but decisions where nothing is expected in return activate posterior regions of vmPFC. This provides a biological distinction of decisions to help that depends on the expectation of external rewards.


Applications


Voting

One of the earliest attempts to formally model the warm glow phenomenon can be found in "A Theory of the Calculus of Voting" by Riker and Ordeshook (1968). Resolving the paradox by which rational individuals would never expend the effort to vote due to the statistical near-improbability of "having their vote count" (casting the decisive vote), Riker and Ordeshook highlighted the psychological utility of voting for one's preferred candidate. Just as an economic warm glow motivates people to willingly forego their scarce resources, the psychological utility described in early voting models serves to explain otherwise irrational behavior. The warm glow of voting continues to be an important consideration in ethical voter models.


Environmental policy

In efforts to design effective, enduring, and efficient environmental interventions, many scholars and policy makers have focused on warm-glow effects. Because many forms of extrinsic rewards and punishments have failed to promote long-term improvements in environmentally conscious behavior, there is a growing emphasis on intrinsic warm glow. Intervention experiments offer promising results in areas such as supporting green energy, recycling and waste reduction, energy consumption, carpooling initiatives.


Business


Corporate social responsibility

Supporting businesses engaged in corporate social responsibility (CSR) initiatives may give consumers a vicarious warm glow. However, recent research suggests that consumers may expect to overpay when companies engage in CSR due to perceptions of price fairness. The implication that "doing good" carries a financial burden for businesses leads consumers to infer general price markups. This body of research cautions that corporate warm glows may be coupled with "cold prickles" of extra costs.


Product advertising

Warm glow can be a central element of
cause marketing Cause marketing is marketing done by a for-profit business that seeks to both increase profits and to better society in accordance with corporate social responsibility, such as by including activist messages in advertising. A similar phrase, cau ...
, in which products are paired with donations. When consumers are exposed to products with a direct cause marketing association, their appraisal of both the product and the company may improve due to warm glow. There is also evidence that product warm glows may play a role in a process called "hedonic licensing", in which consumers who perceive a moral surplus subsequently allow themselves more leeway to make selfish purchases.


Philanthropy


Avoidance behaviors

Common phenomena such as avoiding eye contact with beggars or adjusting one's route to avoid a solicitor may be explained using the warm glow model. One behavioral consequence of warm glow is strategic avoidance of giving opportunities. According to this hypothesis, individuals anticipate their warm glow upon identifying a future giving opportunity. Assuming a functional form that allows warm glow to be negative (driven by a ''guilt'' of not giving), people may strategically and effortfully avoid giving situations. The strategic incentive is easily understood through the utility function U_i = U_(x_,G,g_), where the warm glow (g_i),is positive for a donation (joy of giving) and negative for not giving (guilt). For an agent who would suffer a disutility of giving at their desired level (g_i^*)because the marginal utility of private expenditure (x_i)exceeds the marginal utility of warm-glow giving, they should prefer to give nothing (g_i^0).Because giving nothing may be associated with guilt, the utility of (g_i^0)will be negative. Therefore, for a rational agent who cannot justify giving, U_i(x_i,G,g_i^*) < U_i(x_i,G,g_i^0) , can maximize their utility through avoiding a giving situation, effectively dropping the warm glow argument from their utility functions. Thus, U_i(x_i,G,g_i^*) < U_i(x_i,G,g_i^0) < U_i(x_i, G, 0)suggests avoidance of giving opportunities is a preferred strategy for individuals who experience guilt as a negative warm glow. Economic models assign a cost of effort to avoidance, and predict that people will incur such effort whenever U_ - c_i > U_,where U_is the utility of not giving, c_iis the cost of avoidance, and U_is the utility of giving to a solicitor, conditional upon not avoiding. Through this lens, avoidance can be viewed as an economic commitment device, where a person commits to avoiding a situation (being asked to give) in which they are likely to surrender to temptation (giving). Central to this avoidance hypothesis is that individuals can anticipate their behavior in high-empathy "hot states", while in low-empathy "cold states". While this model assumes a high degree of sophistication on the part of the individual, research by Andreoni, Rao, and Trachtman explores this very phenomenon by observing avoidance and donation behavior of customers entering a supermarket during the holidays. Customers often walked to a further entrance to avoid solicitors for the Salvation Army. According to their model, "empathetically vulnerable" individuals who are not able to give (for budgetary reasons), faced the greatest incentive to avoid collectors because of the guilt they would experience upon saying "no".


Grouping behaviors

Charities may strategically employ categorical donor recognition. For example, a charitable organization may distinguish any gift between $500-$999.99 by a title distinct from that awarded for gifts above $1,000. As a consequence, the social signaling component of the warm-glow effect (in extrinsic operationalizations of warm glow) suggests individuals should be motivated to make the minimum donation to acquire their desired categorical status. Consistent with this hypothesis, research has indicated significant grouping behavior of donors around category minimums.


Inefficiency in charitable allocation

A majority of those who choose to give some portion of their wealth to charity support multiple different causes. Rather than giving 100% of their cumulative donations to the same source, there exists a widespread preference to distribute funds across charities. The warm glow model explains this by recognizing that givers receive multiple warm glows through giving to multiple causes, thus supporting the preference to make multiple small contributions. As a consequence, some scholars suggest an efficiency loss due to high volumes of small donations – which are less efficient to process — rather than fewer large donations. Moral philosopher
Peter Singer Peter Albert David Singer (born 6 July 1946) is an Australian moral philosopher, currently the Ira W. DeCamp Professor of Bioethics at Princeton University. He specialises in applied ethics and approaches ethical issues from a Secularit ...
mentions warm-glow givers in his 2015 book, '' The Most Good You Can Do''. Singer states that these types of donors "give small amounts to many charities ndare not so interested in whether what they are doing helps others." He references "empathetic concern" and "personal distress" as two distinct components of warm-glow givers.


Inefficiency in charitable selection

Warm glow may offer an explanation for some of the observed inefficiencies in charitable giving. For example, United States citizens directed more than 60% of their total charitable contributions to religious groups, education institutions, art organizations, and foundations in 2017; compared to under 7% in foreign aid. According to models of social justice and economic QALYs, in which human lives are treated with equal dignity and equal respect - regardless of race, gender, or place of origin - the goal of charity should be to fight global poverty. Similarly, economic models, which attempt to place a monetary value on the human life, highlight the inefficiency of all philanthropy not used to combat global poverty, which offers the highest marginal return. The warm-glow model accounts for such inefficiency because impure altruists may be insensitive to the actual cause, and more sensitive to the act of giving or size of the gift. Thus, warm-glow may generate philanthropic inefficiencies to the extent that it desensitizes potential donors to the marginal impact of a given charity. In response to this concern,
William MacAskill William David MacAskill (; born 24 March 1987) is a Scottish philosopher and author, as well as one of the originators of the effective altruism movement. He is an Associate Professor in Philosophy and Research Fellow at the Global Priorities I ...
and colleagues have advanced a process of philanthropic allocation called " effective altruism". This methodology seeks to leverage logic and responsibility to identify effective charitable opportunities, thus minimizing the effect of warm-glow in the decision-making process.


Technology

Warm-glow has been found to influence user behavioral intention to adopt a technology.


Criticisms


Ad-hoc

A common criticism of the warm-glow paradigm is that it seems ad-hoc. Indeed, Andreoni, the father of the original model, stated that "putting warm-glow into the model is, while intuitively appealing, an admittedly ''ad hoc'' fix." As the body of research has evolved over nearly 30 years — incorporating philosophical, psychological, and physiological insights{{] Evidence from neural imaging supports the warm-glow effect. A meta-analysis of 36 studies using functional magnetic resonance imaging to observe brains of individuals making decisions to give to others demonstrated that reward networks are consistently activated when giving to others. This includes the ventromedial prefrontal cortex (vmPFC). However, decisions where something was expected in return primarily activate anterior regions of the whereas decisions where nothing was expected in return activated posterior regions of vmPFC. This provided a biological distinction of helping decisions depending on the expectation of exogenous reward. A comparative fMRI meta-analysis of altruistic and strategic decisions to give.


Other applications


Public Health

One application of warm-glow giving is in pay-it-forward sexually transmitted disease (STD) testing. A gay man is given a free STD test alongside messages from the community. After they receive the test, they are asked about donating to support subsequent gay men to receive STD tests. A quasi-experimental study demonstrated that pay-it-forward increased STD testing. – it has become a better descriptive model of behavior.


Self-delusion

An obscure criticism of the warm-glow paradigm is that it necessitates self-deception. This argument states that in order to reap the emotional reward of helping others, one must believe his actions to be motivated altruistically. Yet, the mere existence of a warm glow should then contradict the belief of pure altruism. A question arises as to whether prolonged self-delusion is sustainable and impervious to learning through Self-perception theory, self-perception.


Extensions

Some research has investigated the link between warm glow and the phenomenon of
mere exposure The mere-exposure effect is a psychological phenomenon by which people tend to develop a preference for things merely because they are familiar with them. In social psychology, this effect is sometimes called the familiarity principle. The effect ...
, leading researchers to consider warm glow as a
heuristic A heuristic (; ), or heuristic technique, is any approach to problem solving or self-discovery that employs a practical method that is not guaranteed to be optimal, perfect, or rational, but is nevertheless sufficient for reaching an immediate ...
.{{Cite journal, last=Monin, first=Benoît, date=2003, title=The Warm Glow Heuristic: When Liking Leads to Familiarity., journal=Journal of Personality and Social Psychology, volume=85, issue=6, pages=1035–1048, doi=10.1037/0022-3514.85.6.1035, pmid=14674812, issn=1939-1315


References

{{Reflist, 30em


Further reading

*{{cite book , chapter=Models Involving ‘Warm Glow’ , title=Behavioral Economics and Its Applications , first1=Peter , last1=Diamond , first2=Hannu , last2=Vartiainen , publisher=Princeton University Press , year=2012 , pages=62–65 , isbn=978-1-4008-2914-9 *{{cite book , last=Andreoni , first=James , chapter=Philanthropy , title=Handbook of the Economics of Giving, Altruism and Reciprocity: Applications , editor1-first=Serge-Christophe , editor1-last=Kolm , editor2-first=Jean Mercier , editor2-last=Ythier , publisher=Elsevier , year=2006 , pages=1202–1223 , isbn=978-0-444-52145-3 {{Charity {{DEFAULTSORT:Warm-Glow Giving Altruism Behavioral economics Moral psychology