(A) Equation of Exchange: Monetary policy, like fiscal policy, can also be used either as an alternative or a complementary measure. It can be used for its expansionary or contractionary effects. The classical economists would rely more on the monetary policy. This is because it operates only indirectly and
helps to avoid direct intervention of the public authority in economic
activities. But before we go on to analyze monetary policy, it would
not be out of context to consider the equation of exchange.
In the early present century Sir Irving Fisher introduced
an equation of exchange. This briefly summarizes classical position in
this respect. The equation of exchange can be stated as :
MV = PT
or
MV = PY
or
MV = PY
There are four terms in the equation; two each on the left and right sides.
On the left hand side of the equation we have total supply of money which is M multiplied by V. The letter M stands for total quantity of money in
the form of coins and currency issued by the central bank as the
supreme monetary agency. However, total supply of money is much larger
than this because each unit of money is transferable and capable
of changing hands frequently. The total function of money supply as a
medium of exchange therefore will depend upon the average number of
times a unit changes hands. This is called velocity or frequency
of using money units. Let’s illustrate this: if an individual consumer
starts off with a currency note of $10 in the morning, he may spend it
on purchasing sugar. The sugar merchant later on may purchase fruit
against the same bill. The fruit seller in his turn may buy milk with
the same note. Finally, the note rests with the milkman. During the
course of the day the note of $10 has performed four exchange activities.
$10 worth sugar + $10 fruit + $10 milk + $10 income
of milkman = $40. Thus a single note or quantity (M) of $10 has
performed $40 worth total exchange activity which is the total supply of money.
If this is divided by the quantity 'M' what we get is velocity or the
average number of times a particular unit of currency has been used to
purchase final goods and services over a year.
Total exchange or supply (= 40) M (the quantity = 10) = V
Normally, value of 'V' settles itself between 3 and
4. It is only during highly inflationary conditions that it moves above
4, and under deflationary conditions it falls below 3.
On the right hand side of the equation the two
important terms are 'P', the average price level or index number of
prices and 'T', the volume of trade or transactions. The total volume
of all the goods and services is traded at the national level and hence
it can also be symbolized as real national income 'Y'.
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