Modern monetary theories on short-term exchange rate
volatility take into consideration the short-term capital markets' role and the
long-term impact of the commodity markets on foreign
exchange. These theories hold that the divergence between
the exchange rate and the purchasing power parity is due to the supply and
demand for financial assets and the international capability. One of the modern
monetary theories states that exchange rate volatility is triggered by a
onetime domestic money supply increase, because this is assumed to raise
expectations of higher future monetary growth. The purchasing power parity
theory is extended to include the capital markets.
If, in both countries
whose currencies are exchanged, the demand for money is determined by the level
of domestic income and domestic interest rates, then a higher income increases
demand for transactions balances while a higher interest rate increases the
opportunity cost of holding money, reducing the demand for money. Under a second
approach, the exchange rate adjusts instantaneously to maintain continuous
interest rate parity, but only in the long run to maintain PPP.
Volatility occurs because the commodity markets adjust more
slowly than the financial markets. This version is known as the dynamic
monetary approach. Synthesis of traditional and modern monetary views. In order
to better suit the previous theories to the realities of the market, some of
the more stringent conditions were adjusted into a synthesis of traditional and
modern monetary theories. A short-term capital outflow induced by a monetary
shock creates a payments imbalance that requires an exchange rate change to
maintain balance of payments equilibrium. Speculative forces, commodity markets
disturbances, and the existence of short-term capital mobility trigger the
exchange rate volatility. The degree of change in the exchange rate is a
function of consumers' elasticity of demand. Because the financial markets
adjust faster than the commodities markets, the exchange rate tends to be
affected in the short term by capital market changes and in the long term by
commodities changes.
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