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The cobweb model is generally based on a time lag between supply and demand decisions. 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 ...
This will tend to put downward pressure on the price to make it return to equilibrium. Likewise where the price is below the equilibrium point (also known as the "sweet spot" [3]) there is a shortage in supply leading to an increase in prices back to equilibrium. Not all equilibria are "stable" in the sense of equilibrium property P3.
It follows that the market value of total excess demand in the economy must be zero, which is the statement of Walras's law. Walras's law implies that if there are n markets and n – 1 of these are in equilibrium, then the last market must also be in equilibrium, a property which is essential in the proof of the existence of equilibrium.
An example of real GDP (y) plotted against time (x).Often time is denoted as t instead of x. The IS curve moves to the right if spending plans at any potential interest rate go up, causing the new equilibrium to have higher interest rates (i) and expansion in the "real" economy (real GDP, or Y).
In mathematical economics, the Arrow–Debreu model is a theoretical general equilibrium model. It posits that under certain economic assumptions (convex preferences, perfect competition, and demand independence), there must be a set of prices such that aggregate supplies will equal aggregate demands for every commodity in the economy.
Example of three food carts extending Hotelling's Law, and two carts on a circular path In the case of three pushcarts an unstable equilibrium is reached. Imagine carts A and B are adjacent and each have access to half the potential customers (A’s to the left, B’s to the right).
Bertrand competition is a model of competition used in economics, named after Joseph Louis François Bertrand (1822–1900). It describes interactions among firms (sellers) that set prices and their customers (buyers) that choose quantities at the prices set.
In a Fisher market equilibrium, there is a single price-vector for all agents, but each agent has a different bundle; In a Lindahl equilibrium, there is a personal price-vector for each agent, but all agents have the same bundle. A Lindahl equilibrium allocation in a market of public goods has a characterization without the price-vectors. [6]: