Say's law and Fisher's equation (Quantity Theory
of Money)
Say's law also depends upon the
classical quantity theory of money which is propounded by Irving Fisher
depending on transaction approach. It states that general price level is
function of money supply. Fisher's equation is MV = PT, where, M is the supply
of money, V is velocity of money, P is general price level and T is volume of
transaction or total production. This equation tells that total money supply (MV)
equals the total value of output (PT) in economy. Assuming V and T constant, a
change in the money supply (M) causes a proportional change in the general price
level (P). Thus in monetary economy, it may acts as only medium of exchange to maintain
full employment level.
Labour Market (Pigou's Version)
Pigou's Version has given final
touch to classical theory of employment, who formulated Say's law in terms of
labour market. According to Pigou, under free competition the tendency of
economic system is to automatically provide full employment in labour market.
Flexibility in wage rate assures equilibrium in labour market with full
employment. Real wage rate is determined by the forces of demand and supply of
labour in market. Demand for labour is negative function of real wage rate. In
classical model of employment, changes in money wages and real wages are
directly related and are proportional. Therefore, demand for labour increases
with a fall in real wage rate and decreases with rise in real wage rate.
On the other hand, supply of labour
is positive function of real wage rate. Supply of labour increases if wage rate
increases and it decreases when wage rate falls. Wage rate is determined at the
level where demand for labour and supply of labour are equal. This level of
wage rate represents full employment equilibrium level. According to Pigou, "with
perfectly free competition, there will always be at work a strong tendency for
wage rates to be so related to demand that everybody is employed. He has given
a equation to explain it
N = qY/W, here N is the number of
workers employed, q is fraction of income earned as wages, Y is national income
and W is money wage rate, N can be increased by reducing W. Thus, the key to
full employment is a reduction in money wage. This is explained in following
figures.
In above figure-(A), SL
is supply of labour and DL is demand for labour. At point e, two
curves interest each other, it is point of full employment. NF and
the real wage wage w/p at which full employment is recurred. If the real wage
increased at a higher level than w/p. Supply of labour exceeds the demand
labour by TR. In this situation N1NF number of labours
are unemployed. Unemployment dis-appears only when the wage is reduced to w/p
level. Thus full employment is attained.
In lower figure-(B), MPL
is marginal productivity of labour which slopes downward as more labour are
employed. Since every labour is paid wages equal to its marginal product,
therefore the full employment level NF is reached when the wage rate
falls from w/p1 to w/p.
Criticism of classical theory
Keynes has attacked the classical
theory of employment for its unrealistic assumptions. He criticised classical
theory on the following grounds:
(1) Unrealistic assumption of full employment:
According to Keynes, in free
capitalist economy under employment equilibrium are found in reality and full
employment equilibrium is exception. Because in such economies investments are
not only inadequate but also usually fluctuate.
(2) Say's law ineffective:
Keynes
criticised Say's law of market which tells that supply creates its own demand
and that there is no over production and unemployment. According to Keynes
income is not automatically spent and unemployment according to Keynes is on
account of future to spent current income on consumption and capital goods. In
free market economy supply can't create automatically enough demand within the
economy. But actual state in such economy is fluctuating level of income,
output and employment which depends upon effective demand.
(3) Equality of saving and investment:
According to
Keynes saving depends upon not on the rate of interest but upon level of income
and upon marginal efficiency of capital. A low rate of interest can't increase
investment if business expectations are low.
(4) Pigou's formulation hold not good:
Keynes
attacked on Pigou's thought that a cut in money wage could achieve full
employment in economy. It is applicable for a particular industry not for whole
economy. If wages are reduced in economy that leads to reduction in employment
as a result aggregate demand falls and it leads to decline in employment.
(5) Long-run equilibrium:
Classical economists believe in long
run full-employment equilibrium through a self adjustment process. But Keynes
believed that "In the long-run we are all dead."
(6) Laissez-faire and self-adjustment:
Keynes did not
agree with view of the laissez-faire policy is essential for an automatic and
self adjustment of full employment equilibrium. He believed that capitalist
system is not self-adjusting, because in such economy, there are two classes
rich and poor. Rich people do not spend whole of their income on purchase of their
commodities which lacks aggregate demand and leads to over production and to
depression. Keynes therefore advocated state intervention for adjusting supply
and demand within the economy through fiscal and monetary measures.
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