Economic Models

The Classical model of the economy says that all markets always clear. The labor

market failing to clear does not exist in the Classical model because of

competitive exchange equilibrium in which prices and quantities always adjust

perfectly. The Classical model is of a closed economy and the variables are real

output, employment, real and nominal wages, the price level, and the rate of

interest. It is easier to understand the classical model using five diagrams

that are numbered one through five in Appendix One, The Classical Model. These

diagrams represent the separate parts of the model that together illustrate, for

the most part, the entire Classical model. Diagram one represents the production

function, which shows the assumption that real output, y, is determined by the

level of employment, N. So y is a function of N and from the slope of the

function we can see that output rises as employment is increased. But there is a

diminishing marginal productivity of labor, which means that each time

employment increases, the increase in output will get smaller and smaller.

Diagram one illustrates the relationship between output and employment in the

short run, but does not determine the level of output or the level of

employment. But when used together with other diagrams of the model, diagram one

can be used to figure these things out. Diagram two is the labor market with the

real wage, w, on the vertical axis and employment, N, on the horizontal axis. In

the classical model, the supply of labor depends upon the real-wage level

because as the real wage rises, more people are willing to work. The line SN

represents the labor supply function and the line DN represents the demand for

labor. As the real wage increases so does the labor supply function, but as the

labor supply function increases, the demand for labor decreases. Because the

Classical model makes real wages perfectly flexible and allows it to adjust to

the level that clears the labor market, the real wage and the level of

employment can be figured out by using diagram two. Once given the level of

employment determined from diagram two, it is possible to use diagram one to

figure out the level of output. So diagrams one and two, also know as the real

sector, can be used to determine employment, real output, and the real wage

without any knowledge of the monetary sector of the classical model. The

monetary sector, given the level of real output, determines only the monetary or

nominal variables such as the price level and the money wage. The separate

treatment of the monetary sector and real sector is known as the \'Classical

dichotomy.\' To complete the model, diagrams three, four, and five are needed.

Diagram three represents the Classical aggregate demand curve, which shows the

relationship between real aggregate demand for output, y, on the horizontal

axis, and the price level P, on the vertical axis. Real aggregate demand

represents the sum of the demands for output of all the individuals in the

economy. The Classical aggregate demand curve, AD, illustrates the level of

aggregate demand for a given price level. Since the government or the central

bank can control the quantity of money in circulation, it also controls the

position of the Classical aggregate demand curve. But it can only control the

price level and other nominal variables because it is independent of the

monetary sector. The full understanding of the classical model comes with

diagrams four and five, which consider money-wage determination and interest

rate determination respectively. In diagram four, the real wage, w, is defined

as the money wage, W, divided by the price level, P. For this reason there is a

relationship between money wages and the price level which results in a straight

line through the origin that corresponds to the real wage. The higher the price

level, the higher the money wage must be to maintain any given real wage.

Diagram five determines the interest rate, r, which is expressed as a percentage

per period and depends upon the interaction of the savings and investment

functions. The investment function, I, shows that the lower the rate of

interest, the higher the amount of investment. The savings function, S, shows

that the higher the rate of interest, the more will be saved. Because of the

Classical dichotomy, diagram five is basically to show the breakdown of the use

of income, or the demand for output, between expenditure on consumption and new

capital goods. Like the Classical model, the Keynes model can also be explained

by using five diagrams that

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