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In macroeconomics, a multiplier is a factor of proportionality that measures how much an endogenous variable changes in response to a change in some exogenous variable. For example, suppose variable x changes by k units, which causes another variable y to change by M × k units.
The tableau économique is credited as the "first precise formulation" of interdependent systems in economics and the origin of the theory of the multiplier in economics. [5] An analogous table is used in the theory of money creation under fractional-reserve banking by relending of deposits, leading to the money multiplier.
This model was developed by Paul Samuelson, who credited Alvin Hansen for the inspiration. [ 1 ] [ 2 ] [ 3 ] This model is based on the Keynesian multiplier , which is a consequence of assuming that consumption intentions depend on the level of economic activity, and the accelerator theory of investment , which assumes that investment ...
An economic model is a theoretical construct representing economic processes by a set of variables and a set of logical and/or quantitative relationships between them. The economic model is a simplified, often mathematical , framework designed to illustrate complex processes.
Post-Keynesian economics is a heterodox school that holds that both neo-Keynesian economics and New Keynesian economics are incorrect, and a misinterpretation of Keynes's ideas. The post-Keynesian school encompasses a variety of perspectives, but has been far less influential than the other more mainstream Keynesian schools.
An econometric model then is a set of joint probability distributions to which the true joint probability distribution of the variables under study is supposed to belong. In the case in which the elements of this set can be indexed by a finite number of real-valued parameters , the model is called a parametric model ; otherwise it is a ...
The accelerator effect is shown in the simple accelerator model. This model assumes that the stock of capital goods (K) is proportional to the level of production (Y): K = k×Y. This implies that if k (the capital-output ratio) is constant, an increase in Y requires an increase in K. That is, net investment, I n equals: I n = k×ΔY
In biology, pairwise interactions have historically been the focus of intense study. With the recent advances in network science , it has become possible to scale up pairwise interactions to include individuals of many species involved in many sets of interactions to understand the structure and function of larger ecological networks . [ 29 ]