Supplementary slides in International Macroeconomics & Finance. Exchange Rate Overshooting Dornbusch (1976) JPE. Jarir Ajluni - July 2005. Time. Meaning of Overshooting.
Exchange Rate Overshooting
Dornbusch (1976) JPE
Jarir Ajluni - July 2005
Traditional and monetarists views suggest that after a monetary expansion, prices rise, interest rates falls and consequently the exchange rate is to depreciate (increase), Dornbusch Keynesian sticky-price model show that of the exchange rate would depreciate and ‘Overshoot’ in depreciation then appreciate slowly back to the new equilibrium.
In Dornbusch model, due to expectations and price rigidity the adjustment would take the form of excessive depreciation far beyond the equilibrium level, the exchange rate ‘jumps’ from a to point b
Then the exchange rate does not jump from a to c directly, instead it first ‘overshoots’ to b then slowly appreciates to the new equilibrium level in the Long Run.
The Expected rate of depreciation is proportional to discrepancy between Long-Run and current exchange rate e, the adjustment is measured by theta :
Basic Facts of the Model
I. Capital Mobility and Expectations
Typical money market equilibrium is given in the log transformation:
combining (1),(2),(3) with manipulation, an expression linking the spot exchange rate as a function of current price level and the equilibrium price level, equation (4) is a key equation in the model.
III. The Goods Market
Domestic Output demanded (D) is given by:
IV. The Equilibrium Exchange Rate
Negative relationship between prices and spot exchange rate, for any given price level, exchange rate adjust to maintain equilibrium; hence the QQ curve.
The positively sloped line show a set of combinations of p, e where both goods & markets are in equilibrium.
At initial point b prices are lower than equilibrium & exchange rate is in excess of the Long Run equilibrium, the path of rising prices is accompanied by exchange rate appreciation to its equilibrium @ a
eEffects of monetary expansion
An increase in nominal quantity of money would cause disequilibrium, this should be matched with either increased prices or with exchange rate depreciation.
Since Prices are sticky, and the asset market adjust rapidly comparing with the goods market, the exchange rate would depreciate (increase) to point b and QQ shifts –proportionately- to the right.
Exchange rate depreciate until the Short-Run equilibrium b where this depreciation is enough to anticipate appreciation to compensate the reduction in interest rate after “overshooting” to b,The exchange rate appreciates to the new Long-Run equilibrium at point c.