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where > 0 is the speed of adjustment parameter and is the time derivative of the price — that is, it denotes how fast and in what direction the price changes. By stability theory , P will converge to its equilibrium value if and only if the derivative d ( d P / d t ) d P {\displaystyle {\frac {d(dP/dt)}{dP}}} is negative.
The supply and demand model describes how prices vary as a result of a balance between product availability and demand. 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).
The original equilibrium price is $3.00 and the equilibrium quantity is 100. The government then levies a tax of $0.50 on the sellers. This leads to a new supply curve which is shifted upward by $0.50 compared to the original supply curve. The new equilibrium price will sit between $3.00 and $3.50 and the equilibrium quantity will decrease.
Intertemporal equilibrium is a notion of economic equilibrium conceived over many periods of time. In modern economic theory , most models explicitly take into account the fact that the economy evolves over time, and that its equilibrium cannot be fruitfully analyzed from a purely static perspective.
The transition from the short-run to the long-run may be done by considering some short-run equilibrium that is also a long-run equilibrium as to supply and demand, then comparing that state against a new short-run and long-run equilibrium state from a change that disturbs equilibrium, say in the sales-tax rate, tracing out the short-run ...
Short rate models are often classified as endogenous and exogenous. Endogenous short rate models are short rate models where the term structure of interest rates, or of zero-coupon bond prices (,), is an output of the model, so it is "inside the model" (endogenous) and is determined by the model parameters. Exogenous short rate models are ...
An economic depression for instance, would not necessarily set off a chain of events leading back to full employment and higher wages. Keynes believed that government action was necessary for the economy to recover. In Book V of Keynes's theory, Chapter 19 discusses whether wage rates contribute to unemployment and introduces the Keynes effect.
The tax wedge is the deviation from the equilibrium price and quantity (and , respectively) as a result of the taxation of a good. Because of the tax, consumers pay more for the good ( P c {\displaystyle P_{c}} ) than they did before the tax, and suppliers receive less for the good ( P s {\displaystyle P_{s}} ) than they did before the tax . [ 1 ]