The three most important concepts in macroeconomics are:

1. Unemployment. It refers to a situation when individuals who are able and willing to work cannot find work. In economics, the unemployment rate is the percentage of individuals who do not have jobs. The unemployment rate is the key indicator of the economy's health because it shows that the aggregate labor market is not in equilibrium.
2. Inflation. It refers to a persistent rise in the general price level. An excessive rate of inflation can have a number of adverse effects on the economy. Inflation occurs when the economy grows quickly. Macroeconomics dictate some measure which governments can take to reduce inflation.
3. Gross Domestic Product (GDP). The GDP is the total monetary value of final goods and services produced within the geographical boundaries of a country. Economic growth leads to an increase in the goods and services available in a country. By measuring the GDP, economists can follow the market's swings and changes at any given time.