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No-trade Theorem
In financial economics, the no-trade theorem states that if # markets are in a state of efficient equilibrium # there are no noise traders or other non-rational interferences with prices # the structure by which traders or potential traders acquire information is itself common knowledge then even though some traders may possess private information, none of them will be in a position to profit from it. The assumptions are deliberately unrealistic, but the theorem may nonetheless be pertinent to debates over inside information. It was demonstrated by Paul Milgrom and Nancy Stokey in their 1982 paper, "Information, trade and common knowledge". Informal explanation The idea behind the proof of the no-trade theorem is that if there is common knowledge about the structure of a market, then any bid or offer (i.e. attempt to initiate a trade) will reveal the bidder's private knowledge and will be incorporated into market prices even before anyone accepts the bid or offer, so no prof ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Financial Economics
Financial economics is the branch of economics characterized by a "concentration on monetary activities", in which "money of one type or another is likely to appear on ''both sides'' of a trade".William F. Sharpe"Financial Economics", in Its concern is thus the interrelation of financial variables, such as share prices, interest rates and exchange rates, as opposed to those concerning the real economy. It has two main areas of focus:Merton H. Miller, (1999). The History of Finance: An Eyewitness Account, ''Journal of Portfolio Management''. Summer 1999. asset pricing and corporate finance; the first being the perspective of providers of Financial capital, capital, i.e. investors, and the second of users of capital. It thus provides the theoretical underpinning for much of finance. The subject is concerned with "the allocation and deployment of economic resources, both spatially and across time, in an uncertain environment".See Fama and Miller (1972), ''The Theory of Finance'', ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Efficiency (economics)
In microeconomics, economic efficiency, depending on the context, is usually one of the following two related concepts: * Allocative or Pareto efficiency: any changes made to assist one person would harm another. * Productive efficiency: no additional output of one good can be obtained without decreasing the output of another good, and production proceeds at the lowest possible average total cost. These definitions are not equivalent: a market or other economic system may be allocatively but not productively efficient, or productively but not allocatively efficient. There are also other definitions and measures. All characterizations of economic efficiency are encompassed by the more general engineering concept that a system is efficient or optimal when it maximizes desired outputs (such as utility) given available inputs. Standards of thought There are two main standards of thought on economic efficiency, which respectively emphasize the distortions created by ''govern ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Economic Equilibrium
In economics, economic equilibrium is a situation in which the economic forces of supply and demand are balanced, meaning that economic variables will no longer change. Market equilibrium in this case is a condition where a market price is established through competition such that the amount of goods or services sought by buyers is equal to the amount of goods or services produced by sellers. This price is often called the competitive price or market clearing price and will tend not to change unless demand or supply changes, and quantity is called the "competitive quantity" or market clearing quantity. Understanding economic equilibrium An economic equilibrium is a situation when the economic agent cannot change the situation by adopting any strategy. The concept has been borrowed from the physical sciences. Take a system where physical forces are balanced for instance.This economically interpreted means no further change ensues. Properties of equilibrium Three basic prope ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Noise Trader
A noise trader is a stock trader whose decisions to buy or sell are based on "factors they believe to be helpful but in reality will give them no better returns than random choices". These factors may include hype or rumor, which noise traders believe to be reliable signals of future returns, but which are actually forms of economic noise that cannot be used to accurately predict the future value of a stock. Noise traders do not trade randomly; their decisions are systematic. However, their trading decisions are not based on professional advice or a business's fundamentals, and the purported signals used by noise traders are more unreliable than those used by technical analysts. Therefore, returns on their trading decisions are expected to be no better than random choices. Noise traders often act irrationally: they tend to be emotion-driven, impulsive, reactive, and herd-like. The presence of noise traders in financial markets can cause prices and risk levels to diverge from ex ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Inside Information
Insider trading is the trading of a public company's stock or other securities (such as bonds or stock options) based on material, nonpublic information about the company. In various countries, some kinds of trading based on insider information are illegal. The rationale for this prohibition of insider trading differs between countries and regions. Some view it as unfair to other investors in the market who do not have access to the information, as the investor with inside information could potentially make larger profits than an investor without such information. However, insider trading is also prohibited to prevent the director of a company (the insider) from abusing a company's confidential information for the director's personal gain. The rules governing insider trading are complex and vary significantly from country to country as does the extent of enforcement. The definition of insider in one jurisdiction can be broad and may cover not only insiders themselves but also a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Paul Milgrom
Paul Robert Milgrom (born April 20, 1948) is an American economist. He is the Shirley and Leonard Ely Professor of Humanities and Sciences at the Stanford University School of Humanities and Sciences, a position he has held since 1987. He is a professor in the Stanford School of Engineering as well and a Senior Fellow at the Stanford Institute for Economic Research. Milgrom is an expert in game theory, specifically auction theory and pricing strategies. He is the winner of the 2020 Nobel Memorial Prize in Economic Sciences, together with Robert B. Wilson, "for improvements to auction theory and inventions of new auction formats". He is the co-creator of the no-trade theorem with Nancy Stokey. He is the co-founder of several companies, the most recent of which, Auctionomics, provides software and services for commercial auctions and exchanges. Milgrom and his thesis advisor Wilson designed the auction protocol the FCC uses to determine which phone company gets what cellu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nancy Stokey
Nancy Laura Stokey (born May 8, 1950) has been the Frederick Henry Prince Distinguished Service Professor of Economics at the University of Chicago since 1990 and focuses particularly on mathematical economics while recently conducting research about Growth Theory, economic dynamics, and fiscal/monetary policy. She earned her BA in economics from the University of Pennsylvania in 1972 and her PhD from Harvard University in 1978, under the direction of thesis advisor Kenneth Arrow. She is a Fellow of the Econometric Society, the American Academy of Arts and Sciences and the National Academy of Sciences. She previously served as a co editor of ''Econometrica'' and was a member of the Expert Panel of the Copenhagen Consensus. She received her Honorary Doctor of Laws (L.L.D) in 2012 from the University of Western Ontario. Author Stokey has published significant research in the areas of economic growth and development, as well as papers on economic history ("A Quantitative Model of th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Journal Of Economic Theory
The ''Journal of Economic Theory'' is a bimonthly peer-reviewed academic journal covering the field of economic theory. Karl Shell has served as editor-in-chief of the journal since it was established in 1968. Since 2000, he has shared the editorship with Jess Benhabib, Alessandro Lizzeri, Christian Hellwig, and more recently with Alessandro Pavan, Ricardo Lagos (economist), Ricardo Lagos, Marciano Siniscalchi, and Xavier Vives. The journal is published by Elsevier. In 2020, Tilman Börgers was chief editor of the journal. Abstracting and indexing According to the ''Journal Citation Reports'', the journal has a 2020 impact factor of 1.458. See also *List of economics journals References External links * Economics journals Elsevier academic journals Academic journals established in 1969 English-language journals Bimonthly journals {{econ-journal-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Market Price
A price is the (usually not negative) quantity of payment or compensation expected, required, or given by one party to another in return for goods or services. In some situations, especially when the product is a service rather than a physical good, the price for the service may be called something else such as "rent" or "tuition". Prices are influenced by production costs, supply of the desired product, and demand for the product. A price may be determined by a monopolist or may be imposed on the firm by market conditions. Price can be quoted in currency, quantities of goods or vouchers. * In modern economies, prices are generally expressed in units of some form of currency. (More specifically, for raw materials they are expressed as currency per unit weight, e.g. euros per kilogram or Rands per KG.) * Although prices could be quoted as quantities of other goods or services, this sort of barter exchange is rarely seen. Prices are sometimes quoted in terms of vouch ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Adverse Selection
In economics, insurance, and risk management, adverse selection is a market situation where Information asymmetry, asymmetric information results in a party taking advantage of undisclosed information to benefit more from a contract or trade. In an ideal world, buyers should pay a price which reflects their willingness to pay and the value to them of the product or service, and sellers should sell at a price which reflects the quality of their goods and services. However, when one party holds information that the other party does not have, they have the opportunity to damage the other party by maximizing self-utility, concealing relevant information, and perhaps even lying. This opportunity has secondary effects: the party without the information may take steps to avoid entering into an unfair contract, perhaps by withdrawing from the interaction; a party may ask for higher or lower prices, diminishing the volume of trade in the market; or parties may be deterred from participatin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Myerson–Satterthwaite Theorem
The Myerson–Satterthwaite theorem is an important result in mechanism design and the economics of asymmetric information, and named for Roger Myerson and Mark Satterthwaite. Informally, the result says that there is no efficient way for two parties to trade a good when they each have secret and probabilistically varying valuations for it, without the risk of forcing one party to trade at a loss. The Myerson–Satterthwaite theorem is among the most remarkable and universally applicable negative results in economics—a kind of negative mirror to the fundamental theorems of welfare economics. It is, however, much less famous than those results or Arrow's earlier result on the impossibility of satisfactory electoral systems. Notation There are two agents: Sally (the seller) and Bob (the buyer). Sally holds an item that is valuable for both her and Bob. Each agent values the item differently: Bob values it as v_B and Sally as v_S. Each agent knows his/her own valuation with c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Economics Theorems
Economics () is a behavioral science that studies the production, distribution, and consumption of goods and services. Economics focuses on the behaviour and interactions of economic agents and how economies work. Microeconomics analyses what is viewed as basic elements within economies, including individual agents and markets, their interactions, and the outcomes of interactions. Individual agents may include, for example, households, firms, buyers, and sellers. Macroeconomics analyses economies as systems where production, distribution, consumption, savings, and investment expenditure interact; and the factors of production affecting them, such as: labour, capital, land, and enterprise, inflation, economic growth, and public policies that impact these elements. It also seeks to analyse and describe the global economy. Other broad distinctions within economics include those between positive economics, describing "what is", and normative economics, advocating "what o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
