In finance, the exchange rates is also known as the foreign-exchange rate, forex rate or FX rate. Between two currencies it is specified by the exchange rates that how much one currency is worth in terms of the other. The value of a foreign nation’s currency in terms of the home nation’s currency is given by exchange rates. For instance an exchange rate of 95 Japanese yen (JPY, ¥) to the United States dollar (USD, $) means that the value of JPY 95 is the same as USD 1. One of the largest markets in the world is the foreign exchange market. According to an estimates, every day about 3.2 trillion USD worth of currency are exchanged.
the current exchange rate is referred to as the spot exchange rate. The forward exchange rate refers to such type of exchange rate that is quoted and traded today but its delivery and payment is agreed on a specific future date.
Free or pegged Exchange Rates
If a currency is free-floating, then its exchange rate is permitted to vary against that of other currencies and this exchange rate is determined by the market forces of supply and demand. For such currencies exchange rates are likely to change almost constantly as quoted on financial markets, mainly by banks, around the world.
A movable or adjustable peg system is referred to a system where there are fixed exchange rates, but it is having a provision for the devaluation of a currency. For example, the Chinese yuan renminbi (RMB) was pegged to the United States dollar at RMB 8.2768 to $1, between 1994 and 2005. China was not the only country which has done this; from the end of World War II until 1966, fixed exchange rates with the US dollar has been maintained by all Western European countries that is based on the Bretton Woods system.
Nominal and real exchange rates
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the price in foreign currency of one unit of a domestic currency are called as the nominal exchange rate and its symbol is e.
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We can define the real exchange rate (RER) as
, here Pf is the foreign price level and P the domestic price level.
The RER has taken its base from the GDP deflator measurement of the price level in the domestic and foreign countries (P,Pf), which in a given base year is arbitrarily set equal to 1. Therefore, depending on which year is chosen as the base year for the GDP deflator of two countries, the level of the RER is arbitrarily set. If the situation is that all goods were freely tradable, and identical baskets of goods are being purchased by foreign and domestic residents, then the purchasing power parity (PPP) would hold for the GDP deflators of the two countries, and we will get the RER which would be constant and equal to one.
Bilateral vs. effective exchange rate
A currency pair is involved in Bilateral exchange rate, while effective exchange rate is weighted average of a basket of foreign currencies, and it can be considered as an overall measure of the country’s external competitiveness. With the inverse of the asymptotic trade weights a nominal effective exchange rate (NEER) is weighted. A real effective exchange rate (REER) deflates NEER by the home country price level and adjust it by appropriate foreign price level. Considering the global investment phenomenon a GDP weighted effective exchange rate as compared to NEER, might be more appropriate.
Uncovered interest rate parity
It is stated by Uncovered interest rate parity (UIRP) that we can neutralize an appreciation or depreciation of one currency against another currency by a change in the interest rate differential. If Japanese interest rates remain same while the US interest rates increase then the US dollar should depreciate against the Japanese yen by an amount that could prevent arbitrage. The future exchange rate is reflected into the forward exchange rate that is stated today. In our example, it is said that the forward exchange rate of the dollar is at a discount because it buys fewer Japanese yen in the forward rate than what it does in the spot rate. The it is said that yen is at a premium.
There are no proof of the working of UIRP after 1990s. Opposite to the theory, currencies having0 high interest rates are characteristically appreciated rather than depreciated on the reward of the containment of inflation and a higher-yielding currency.
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