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Flexible Prices Model

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CHAPTER 5. FLEXIBLE PRICES: THE MONETARY MODEL

The monetary approach was the earliest approach to explain the related phenomena of exchange rate variations, on the other hand, and the BOP, in the other. While it is completely inadequate in explaining the wild day-to-day, month-to-month gyrations seen in recent years, it nonetheless provides some useful insights into the broader picture of long run trends. It consists of two basic building blocks: PPP and demand for money.

5.1 The Simple Monetary Model of a Floating Exchange Rate

5.1.1 The Setting:

a. AS is vertical

This does not imply that output is constant. It can only vary as the result of a change in the productivity of the economy: accumulation of capital, growth in the labor force or its educational level, etc.. And a vertical AS curve presupposes perfect price flexibility in all markets.

b. The demand for real money balances is a stable function of only a few domestic macroeconomic variables. In fact, for the moment and till further notice, we shall work with the Cambridge quantity equation provided below:

Md = kPy k > 0

Given a money stock, MS0, equilibrium means:

MS0 = Md = kPy = kY

The figure below shows that the fall in the price level is of the same proportion as the rise in income as we move from A to D. However, a change in MS would shift AD curve. AD curve will shift upward and to the right when there is an increase in MS. At point B, P1 must be greater than P0 by the same proportion as MS1 is greater than MS0.

c. PPP obtains at all times

PYen = P$ ´ S Yen/$ or S.P* = P

This equation states PP of each country's currency must be the same whether spent on the domestic market or converted into foreign currency and spent abroad.

Consider the figure below where the vertical axis plots the domestic price level, and the horizontal plots spot exchange rate.

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