When the price of a product you want to buy goes up, it affects you. But why does the price go up? Is the demand greater than the supply? Did the cost go up because of the raw materials that make the CD? Or, was it a war in an unknown country that affected the price? In order to answer these questions, we need to turn to macroeconomics.

TUTORIAL: Economics

What Is It?
Macroeconomics is the study of the behavior of the economy as a whole. This is different from microeconomics, which concentrates more on individuals and how they make economic decisions. Needless to say, macroeconomy is very complicated and there are many factors that influence it. These factors are analyzed with various economic indicators that tell us about the overall health of the economy.

Macroeconomists try to forecast economic conditions to help consumers, firms and governments make better decisions.

  • Consumers want to know how easy it will be to find work, how much it will cost to buy goods and services in the market, or how much it may cost to borrow money.
  • Businesses use macroeconomic analysis to determine whether expanding production will be welcomed by the market. Will consumers have enough money to buy the products, or will the products sit on shelves and collect dust?
  • Governments turn to the macroeconomy when budgeting spending, creating taxes, deciding on interest rates and making policy decisions.

Macroeconomic analysis broadly focuses on three things: national output (measured by gross domestic product (GDP)), unemployment and inflation. (For background reading, see The Importance Of Inflation And GDP.)

National Output: GDP
Output, the most important concept of macroeconomics, refers to the total amount of goods and services a country produces, commonly known as the gross domestic product. The figure is like a snapshot of the economy at a certain point in time.

When referring to GDP, macroeconomists tend to use real GDP, which takes inflation into account, as opposed to nominal GDP, which reflects only changes in prices. The nominal GDP figure will be higher if inflation goes up from year to year, so it is not necessarily indicative of higher output levels, only of higher prices.

The one drawback of the GDP is that because the information has to be collected after a specified time period has finished, a figure for the GDP today would have to be an estimate. GDP is nonetheless like a stepping stone into macroeconomic analysis. Once a series of figures is collected over a period of time, they can be compared, and economists and investors can begin to decipher the business cycles, which are made up of the alternating periods between economic recessions (slumps) and expansions (booms) that have occurred over time. (For more, see High GDP Means Economic Prosperity, Or Does It?)

From there we can begin to look at the reasons why the cycles took place, which could be government policy, consumer behavior or international phenomena, among other things. Of course, these figures can be compared across economies as well. Hence, we can determine which foreign countries are economically strong or weak.

Based on what they learn from the past, analysts can then begin to forecast the future state of the economy. It is important to remember that what determines human behavior and ultimately the economy can never be forecasted completely.

Unemployment
The unemployment rate tells macroeconomists how many people from the available pool of labor (the labor force) are unable to find work. (For more about employment, see Surveying The Employment Report.)

Macroeconomists have come to agree that when the economy has witnessed growth from period to period, which is indicated in the GDP growth rate, unemployment levels tend to be low. This is because with rising (real) GDP levels, we know that output is higher, and, hence, more laborers are needed to keep up with the greater levels of production.

Inflation
The third main factor that macroeconomists look at is the inflation rate, or the rate at which prices rise. Inflation is primarily measured in two ways: through the Consumer Price Index (CPI) and the GDP deflator. The CPI gives the current price of a selected basket of goods and services that is updated periodically. The GDP deflator is the ratio of nominal GDP to real GDP. (For more on this, see The Consumer Price Index: A Friend To Investors and The Consumer Price Index Controversy.)

If nominal GDP is higher than real GDP, we can assume that the prices of goods and services has been rising. Both the CPI and GDP deflator tend to move in the same direction and differ by less than 1%. (If you'd like to learn more about inflation, check out our Tutorial: All About Inflation.)

Demand and Disposable Income
What ultimately determines output is demand. Demand comes from consumers (for investment or savings - residential and business related), from the government (spending on goods and services of federal employees) and from imports and exports.

Demand alone, however, will not determine how much is produced. What consumers demand is not necessarily what they can afford to buy, so in order to determine demand, a consumer's disposable income must also be measured. This is the amount of money after taxes left for spending and/or investment.

In order to calculate disposable income, a worker's wages must be quantified as well. Salary is a function of two main components: the minimum salary for which employees will work and the amount employers are willing to pay in order to keep the worker in employment. Given that the demand and supply go hand in hand, the salary level will suffer in times of high unemployment, and it will prosper when unemployment levels are low.

Demand inherently will determine supply (production levels) and an equilibrium will be reached; however, in order to feed demand and supply, money is needed. The central bank (the Federal Reserve in the U.S.) prints all money that is in circulation in the economy. The sum of all individual demand determines how much money is needed in the economy. To determine this, economists look at the nominal GDP, which measures the aggregate level of transactions, to determine a suitable level of money supply.

Greasing the Engine of the Economy - What the Government Can Do

Monetary Policy
A simple example of monetary policy is the central bank's open-market operations. (For more detail, see our Tutorial: The Federal Reserve.) When there is a need to increase cash in the economy, the central bank will buy government bonds (monetary expansion). These securities allow the central bank to inject the economy with an immediate supply of cash. In turn, interest rates, the cost to borrow money, will be reduced because the demand for the bonds will increase their price and push the interest rate down. In theory, more people and businesses will then buy and invest. Demand for goods and services will rise and, as a result, output will increase. In order to cope with increased levels of production, unemployment levels should fall and wages should rise.

On the other hand, when the central bank needs to absorb extra money in the economy, and push inflation levels down, it will sell its T-bills. This will result in higher interest rates (less borrowing, less spending and investment) and less demand, which will ultimately push down price level (inflation) but will also result in less real output.

Fiscal Policy
The government can also increase taxes or lower government spending in order to conduct a fiscal contraction. What this will do is lower real output because less government spending means less disposable income for consumers. And, because more of consumers' wages will go to taxes, demand as well as output will decrease.

A fiscal expansion by the government would mean that taxes are decreased or government spending is increased. Ether way, the result will be growth in real output because the government will stir demand with increased spending. In the meantime, a consumer with more disposable income will be willing to buy more.

A government will tend to use a combination of both monetary and fiscal options when setting policies that deal with the macroeconomy.

The Bottom Line
The performance of the economy is important to all of us. We analyze the macroeconomy by primarily looking at national output, unemployment and inflation. Although it is consumers who ultimately determine the direction of the economy, governments also influence it through fiscal and monetary policy.

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