Tightness may refer to: In mathematics, * Tightness of (a collection of) measures is a concept in measure (and probability) theory * Tightness (topology) is also a

cardinal function In mathematics, a cardinal function (or cardinal invariant) is a function that returns cardinal numbers. Cardinal functions in set theory * The most frequently used cardinal function is a function that assigns to a set ''A'' its cardinality, d ...

used in general topology In

economics Economics () is the social 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 analy ...

, * Tightness refers to the degree to which the number of unemployed workers exceed the number of posted job vacancies (or vice versa). *

Market tightness Market tightness is a measure of the liquidity of a market. High market tightness indicates relatively low liquidity and high transaction costs, whereas low market tightness indicates high liquidity and low transaction costs. For example, during th ...

, a point in time where it is very difficult to invest, but it is far easier to sell or to remove investments in return of monetary rewards In other fields, * Tightness of a rope indicates the rope is under

tension Tension may refer to: Science * Psychological stress * Tension (physics), a force related to the stretching of an object (the opposite of compression) * Tension (geology), a stress which stretches rocks in two opposite directions * Voltage or el ...

* Tightness of a sealing means it is

impermeable Permeability, permeable, and semipermeable may refer to: Chemistry *Semipermeable membrane, a membrane which will allow certain molecules or ions to pass through it by diffusion *Vascular permeability, the movement of fluids and molecules betwe ...

, that it seals well * Tightness is the art of being 'tight' (i.e., stingy or

miser A miser is a person who is reluctant to spend, sometimes to the point of forgoing even basic comforts and some necessities, in order to hoard money or other possessions. Although the word is sometimes used loosely to characterise anyone who ...

ly) * Tightness can refer to something being

cool Cool commonly refers to: * Cool, a moderately low temperature * Cool (aesthetic), an aesthetic of attitude, behavior, and style Cool or COOL may also refer to: Economics * Country of origin labelling * mCOOL - US consumer legislation to enforc ...

See also