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In most simple microeconomic stories of supply and demand a static equilibrium is observed in a market; however, economic equilibrium can be also dynamic. Equilibrium may also be economy-wide or general, as opposed to the partial equilibrium of a single market. Equilibrium can change if there is a change in demand or supply conditions.
The money market equilibrium diagram. The LM curve shows the combinations of interest rates and levels of real income for which the money market is in equilibrium. It shows where money demand equals money supply. For the LM curve, the independent variable is income and the dependent variable is the interest rate.
Agricultural markets are a context where the cobweb model might apply, since there is a lag between planting and harvesting (Kaldor, 1934, p. 133–134 gives two agricultural examples: rubber and corn). Suppose for example that as a result of unexpectedly bad weather, farmers go to market with an unusually small crop of strawberries.
Partial equilibrium, as the name suggests, takes into consideration only a part of the market to attain equilibrium. Jain proposes (attributed to George Stigler ): "A partial equilibrium is one which is based on only a restricted range of data, a standard example is price of a single product, the prices of all other products being held fixed ...
The conceptual framework of equilibrium in a market economy was developed by Léon Walras [7] and further extended by Vilfredo Pareto. [8] It was examined with close attention to generality and rigour by twentieth century mathematical economists including Abraham Wald, [9] Paul Samuelson, [10] Kenneth Arrow and Gérard Debreu. [11]
Elhanan Helpman and Paul Krugman (1985, p.23-24) [8] further used equal-trade-volume lines to illustrate trade equilibrium and the trade basics in the IWE diagram. Guo (2023) [ 9 ] introduced a Dixit-Norman constant and used the equal trade volume line to obtain the general trade equilibrium by
The graph depicts an increase (that is, right-shift) in demand from D 1 to D 2 along with the consequent increase in price and quantity required to reach a new equilibrium point on the supply curve (S). A common and specific example is the supply-and-demand graph shown at right.
A competitive equilibrium (CE) consists of two elements: A price function . It takes as argument a vector representing a bundle of commodities, and returns a positive real number that represents its price. Usually the price function is linear - it is represented as a vector of prices, a price for each commodity type.