Forex Tutorial: Economic Theories, Models, Feeds & Data
There is a great deal of academic theory revolving around currencies. While often not applicable directly to day-to-day trading, it is helpful to understand the overarching ideas behind the academic research.
The main economic theories found in the foreign exchange deal with parity conditions. A parity condition is an economic explanation of the price at which two currencies should be exchanged, based on factors such as inflation and interest rates. The economic theories suggest that when the parity condition does not hold, an arbitrage opportunity exists for market participants. However, arbitrage opportunities, as in many other markets, are quickly discovered and eliminated before even giving the individual investor an opportunity to capitalize on them. Other theories are based on economic factors such as trade, capital flows and the way a country runs its operations. We review each of them briefly below.
Major Theories: Purchasing Power Parity Purchasing Power Parity (PPP) is the economic theory that price levels between two countries should be equivalent to one another after exchange-rate adjustment. The basis of this theory is the law of one price, where the cost of an identical good should be the same around the world. Based on the theory, if there is a large difference in price between two countries for the same product after exchange rate adjustment, an arbitrage opportunity is created, because the product can be obtained from the country that sells it for the lowest price.
The relative version of PPP is as follows:
Major Theories: Purchasing Power Parity Purchasing Power Parity (PPP) is the economic theory that price levels between two countries should be equivalent to one another after exchange-rate adjustment. The basis of this theory is the law of one price, where the cost of an identical good should be the same around the world. Based on the theory, if there is a large difference in price between two countries for the same product after exchange rate adjustment, an arbitrage opportunity is created, because the product can be obtained from the country that sells it for the lowest price.
The relative version of PPP is as follows:
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Where 'e' represents the rate of change in the exchange rate and 'π1' and 'π2'represent the rates of inflation for country 1 and country 2, respectively.
For example, if the inflation rate for country XYZ is 10% and the inflation for country ABC is 5%, then ABC's currency should appreciate 4.76% against that of XYZ.
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Interest Rate Parity The concept of Interest Rate Parity (IRP) is similar to PPP, in that it suggests that for there to be no arbitrage opportunities, two assets in two different countries should have similar interest rates, as long as the risk for each is the same. The basis for this parity is also the law of one price, in that the purchase of one investment asset in one country should yield the same return as the exact same asset in another country; otherwise exchange rates would have to adjust to make up for the difference.
The formula for determining IRP can be found by:
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Where 'F' represents the forward exchange rate; 'S' represents the spot exchange rate; 'i1' represents the interest rate in country 1; and 'i2' represents the interest rate in country 2.
International Fisher Effect The International Fisher Effect (
The formula for
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Where 'e' represents the rate of change in the exchange rate and 'i1' and 'i2'represent the rates of inflation for country 1 and country 2, respectively.
Balance of Payments Theory A country's balance of payments is comprised of two segments - the current account and the capital account - which measure the inflows and outflows of goods and capital for a country. The balance of payments theory looks at the current account, which is the account dealing with trade of tangible goods, to get an idea of exchange-rate directions.
If a country is running a large current account surplus or deficit, it is a sign that a country's exchange rate is out of equilibrium. To bring the current account back into equilibrium, the exchange rate will need to adjust over time. If a country is running a large deficit (more imports than exports), the domestic currency will depreciate. On the other hand, a surplus would lead to currency appreciation.
The balance of payments identity is found by:
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Real Interest Rate Differentiation Model The Real Interest Rate Differential Model simply suggests that countries with higher real interest rates will see their currencies appreciate against countries with lower interest rates. The reason for this is that investors around the world will move their money to countries with higher real rates to earn higher returns, which bids up the price of the higher real rate currency.
Asset Market Model The Asset Market Model looks at the inflow of money into a country by foreign investors for the purpose of purchasing assets such as stocks, bonds and other financial instruments. If a country is seeing large inflows by foreign investors, the price of its currency is expected to increase, as the domestic currency needs to be purchased by these foreign investors. This theory considers the capital account of the balance of trade compared to the current account in the prior theory. This model has gained more acceptance as the capital accounts of countries are starting to greatly outpace the current account as international money flow increases.
Monetary Model The Monetary Model focuses on a country's monetary policy to help determine the exchange rate. A country's monetary policy deals with the money supply of that country, which is determined by both the interest rate set by central banks and the amount of money printed by the treasury. Countries that adopt a monetary policy that rapidly grows its monetary supply will see inflationary pressure due to the increased amount of money in circulation. This leads to a devaluation of the currency.
These economic theories, which are based on assumptions and perfect situations, help to illustrate the basic fundamentals of currencies and how they are impacted by economic factors. However, the fact that there are so many conflicting theories indicates the difficulty in any one of them being 100% accurate in predicting currency fluctuations. Their importance will likely vary by the different market environment, but it is still important to know the fundamental basis behind each of the theories.
Economic Data Economic theories may move currencies in the long term, but on a shorter-term, day-to-day or week-to-week basis, economic data has a more significant impact. It is often said the biggest companies in the world are actually countries and that their currency is essentially shares in that country. Economic data, such as the latest gross domestic product (GDP) numbers, are often considered to be like a company's latest earnings data. In the same way that financial news and current events can affect a company's stock price, news and information about a country can have a major impact on the direction of that country's currency. Changes in interest rates, inflation, unemployment, consumer confidence, GDP, political stability etc. can all lead to extremely large gains/losses depending on the nature of the announcement and the current state of the country.
The number of economic announcements made each day from around the world can be intimidating, but as one spends more time learning about the forex market it becomes clear which announcements have the greatest influence. Listed below are a number of economic indicators that are generally considered to have the greatest influence - regardless of which country the announcement comes from.
Employment Data Most countries release data about the number of people that currently are employed within that economy. In theU.S. , this data is known as non-farm payrolls and is released the first Friday of the month by the Bureau of Labor Statistics. In most cases, strong increases in employment signal that a country enjoys a prosperous economy, while decreases are a sign of potential contraction. If a country has gone recently through economic troubles, strong employment data could send the currency higher because it is a sign of economic health and recovery. On the other hand, high employment can also lead to inflation, so this data could send the currency downward. In other words, economic data and the movement of currency will often depend on the circumstances that exist when the data is released.
Interest Rates As was seen with some of the economic theories, interest rates are a major focus in the forex market. The most focus by market participants, in terms of interest rates, is placed on the country's central bank changes of its bank rate, which is used to adjust monetary supply and institute the country's monetary policy. In theU.S. , the Federal Open Market Committee (FOMC) determines the bank rate, or the rate at which commercial banks can borrow and lend to the U.S. Treasury. The FOMC meets eight times a year to make decisions on whether to raise, lower or leave the bank rate the same; and each meeting, along with the minutes, is a point of focus. (For more on central banks read Get to Know the Major Central Banks.)
Monetary Model The Monetary Model focuses on a country's monetary policy to help determine the exchange rate. A country's monetary policy deals with the money supply of that country, which is determined by both the interest rate set by central banks and the amount of money printed by the treasury. Countries that adopt a monetary policy that rapidly grows its monetary supply will see inflationary pressure due to the increased amount of money in circulation. This leads to a devaluation of the currency.
These economic theories, which are based on assumptions and perfect situations, help to illustrate the basic fundamentals of currencies and how they are impacted by economic factors. However, the fact that there are so many conflicting theories indicates the difficulty in any one of them being 100% accurate in predicting currency fluctuations. Their importance will likely vary by the different market environment, but it is still important to know the fundamental basis behind each of the theories.
Economic Data Economic theories may move currencies in the long term, but on a shorter-term, day-to-day or week-to-week basis, economic data has a more significant impact. It is often said the biggest companies in the world are actually countries and that their currency is essentially shares in that country. Economic data, such as the latest gross domestic product (GDP) numbers, are often considered to be like a company's latest earnings data. In the same way that financial news and current events can affect a company's stock price, news and information about a country can have a major impact on the direction of that country's currency. Changes in interest rates, inflation, unemployment, consumer confidence, GDP, political stability etc. can all lead to extremely large gains/losses depending on the nature of the announcement and the current state of the country.
The number of economic announcements made each day from around the world can be intimidating, but as one spends more time learning about the forex market it becomes clear which announcements have the greatest influence. Listed below are a number of economic indicators that are generally considered to have the greatest influence - regardless of which country the announcement comes from.
Employment Data Most countries release data about the number of people that currently are employed within that economy. In the
Interest Rates As was seen with some of the economic theories, interest rates are a major focus in the forex market. The most focus by market participants, in terms of interest rates, is placed on the country's central bank changes of its bank rate, which is used to adjust monetary supply and institute the country's monetary policy. In the
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