(A) Downward Sloping Curve D: In case of a
competitive firm, price is given and fixed. Demand or Average Revenue
curve is perfectly flexible and is a horizontal straight line. A
monopolist has the freedom to charge a higher or lower price. With a
change in the price, the quantity demanded also alters. Again a
monopolist is a single seller. He himself is a firm as well as an
industry. Hence market demand curve is in itself the demand curve of
the monopolist. As a result of this the demand curve of a monopolist is
downward sloping.
This has been shown in Figure 40. DD in the figure
is the Demand or Average Revenue curve of a monopolist. When the
Average Revenue curve falls, the corresponding Marginal Revenue curve
also falls and is below the AR curve. The usual law about the behavior
of average and marginal quantities governs such a relation between AR
and MR.
(B) AR-MR Relationship: The relation between
Average and Marginal Revenue is similar to that of the behavior of
average and marginal quantities in general, such as costs, wages etc.
When the marginal quantity is constant, average quantity is also
constant and the two values are identical. When the marginal quantity
increases, the average quantity likewise increases and is lower than the
marginal quantity. On the other hand, when the marginal quantity
decreases the average quantity falls but is above or greater than the
marginal value. This has been illustrated in the table below.
The table makes the MR-AR relationship clear. In
part I where total quantity increases from 10 to 20 to 30 marginal
quantity remains constant at 10 (20 -10 = 10, 30 - 20 = 10). Average quantity is also constant and equal to 10 (20 ¸ 2 = 10, 30 ¸
3 = 10). When the marginal quantity increases as 10, 15, 20 though the
average quantity increases it is smaller in value and is below the
marginal quantity. When the marginal value falls as 10, 8, 6 the
average value also tends to fall as 10, 9, 8. In this case, average
value is more than and above marginal value. This has further been made
clear with an arrow diagram in Figure 41.
Here A the average quantity and M the marginal quantity are equal when the two are constant. When A rises, M1 is above A and when A falls, M2
is below A. This relationship is applicable to all forms of markets
and for all average marginal quantities. The reason for such behavior is
simple. It is Marginal Change which makes the average quantity behave
one way or the other. Marginal Change is a single unit
change whereas average value gets distributed over all previous units.
When M increases from 10 to 15, 5 is added to M. This value is
distributed over two units to produce Average Change of 5 ¸ 2 = 2.5; hence the rise from 10 to 12.5.
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