A currency exchange system in which the value between currencies of each country is determined by the supply-demand relationship of the foreign exchange market. It is often called a floating exchange rate system for short. The opposite of this is the fixed exchange rate system.
The floating exchange rate system
It is a system that freely fluctuates the exchange rate according to the supply and demand of the foreign exchange market known as a “float system”. The floating exchange rate system has the advantage that economic conditions are reflected in the exchange rate and the discretion of monetary policy increases, but it has the disadvantage that the exchange rate fluctuates sharply, such as fluctuations due to speculative money.
The fixed exchange rate system
It is a system that fixes the exchange rate to a specific level or limits fluctuations to a minimum known as a “peg system”. The fixed exchange rate system is because there are no market fluctuations due to imports and exports. The fixed exchange rate system includes the “dollar peg” that keeps the exchange rate between the home currency and the US dollar at a fixed rate, notably:
- Due to a depreciated currency, it is easier to adapt to external demand.
- A discretionary monetary policy.
- Markets will be reflective of the economic situation.

Benefits of a fixed exchange rate
The currency of a country with a small economy has a small trading volume; there is a risk that the rate will move violently if it is set to a floating exchange rate. If it is too unstable, you won’t be able to trade with confidence, so to avoid that, we’re suppressing fluctuations in exchange rates.
World Exchange rate system:
The world exchange rate system is roughly divided into two, the “floating exchange rate system” and the “fixed exchange rate system”. The United States has the former floating exchange rate system, and the exchange rate, which indicates the ratio when exchanging two currencies, is naturally determined in the market. In other words, when exchanging the US currency dollar for the Canadian Dollar, the exchange rate is determined by the power relationship between the demands of “I want to buy the Canadian Dollar” and “I want to buy the US dollar”.
Characteristics of floating exchange rate system
- Fiscal policy:
If a country with a closed economy increases its fiscal spending to improve national income, interest rates will rise at the same time as national income will increase. However, in the case of an open economy system, the interest rate of a small country exceeds the world standard interest rate, so international capital will buy the currency of the small country.
In a floating exchange rate system, the inflow of international capital does not result in an increase in the domestic money supply, but only in currency appreciation. Although it seems strange from the conventional image that the inflow of international capital creates a bubble, the money supply does not increase and the appreciation of the currency puts deceleration pressure on the economy.
- Financial policy:
If a country with a closed economy implements monetary easing to improve national income, interest rates will fall at the same time as national income and money supply will increase. Furthermore, in the case of an open economy system, the interest rate of a small country is lower than the world standard interest rate, so international capital sells the currency of the small country.
In a floating exchange rate system, the outflow of international capital does not result in a decrease in the domestic money supply but results in a currency depreciation effect.

Characteristics of Fixed exchange rate system:
- Fiscal policy:
If a country with a closed economy increases its fiscal spending to improve national income, interest rates will rise at the same time as national income will increase. However, in the case of an open economy system, the interest rate of a small country exceeds the world standard interest rate, so international capital will buy the currency of the small country. In the fixed exchange rate system, the inflow of international capital does not bring about a currency appreciation, but brings about an increase in the domestic money supply and lowers interest rates. This decline in interest rates will reduce the crowding effect and increases national income. Interest rates will fall until they match the world standard interest rate, and the crowding effect will disappear.
- Financial policy:
If a country with a closed economy implements monetary easing to improve national income, interest rates will fall at the same time as national income and money supply will increase. Furthermore, in the case of an open economy system, the interest rate of a small country is lower than the world standard interest rate, so that international capital sells the currency of the small country. In the fixed exchange rate system, the outflow of international capital does not bring about currency depreciation, but causes a decrease in the domestic money supply and raises interest rates. This rise in interest rates will reduce private investment and national income. Interest rates will rise until they match global interest rates, offsetting the effects of monetary policy by 100%.