Given the supply and demand curves in their aggregate form, an equilibrium level can be established at the point of their intersection.
In figure 16, AD and SAS are such short run curves.
The two have intersected at point E which is the equilibrium; the price
that is commonly offered and received is P and quantity exchanged is Y
(P and Y bar). This is only an initial equilibrium and it can alter with a shift in either the demand or supply curves.
In figure 17 such a shift upwards in the aggregate
demand curve has been shown. This causes equilibrium position to shift
as well from E to E1. In the new equilibrium position price level rises from P to P1 and real output quantity exchanged increases from Y to Y1. Such an increase in the real output becomes possible because between E and E1
we were still operating along the short run supply phase, where some
resources were underutilized. But once the point E1 is reached the
supply curve becomes steep and vertical. Here the full employment level
is reached and no more resources are available for further additions to
be made to the real output. Therefore E1Y1 is a vertical full employment long run supply curve (LAS). Points such as E are partial equilibrium under employable points.
Finally in figure 18 we have an interesting case
where aggregate demand shifts and increases beyond full employment
level. In this case E1 is the original point of equilibrium with AD1 and SAS1
having intersected at this point. However this happens to be the full
employment condition and LAS passes through this point which is Y1E1. If aggregate demand further shifts upwards as shown by AD2 then a new point of equilibrium is attained at E2 where AD2 and SAS1 have intersected. The new price level is then P2 and output quantity Y2
. However, since all available resources were fully employed and
exhausted at Y output level, this increase is purely a monetary
phenomenon caused by rising price level. Therefore movement from Y1 to Y2
is only an increase in money value of the real output. This becomes
possible because contracted agents of production have secured a hike in
their wages, rent and interests. As a result of increase in input
prices and consequent rise in the cost of production, the supply curve
shifts upwards as SAS2. Yet another point of intersection between AD2 and SAS2 becomes possible at a new equilibrium level E3.
In this equilibrium position we revert to the old full employment
level of output Y1though the price level is now higher than before as P2.
Thus in the long run after all adjustments have taken place the
economy settles down at the full employment level and only price level
rises upwards due to inflationary pressure.
Tidak ada komentar:
Posting Komentar
Terima Kasih