Every economy is constantly in a state of flux, moving from one phase to another. These phases can be described as recovery, expansion, recession and slump. Understanding these phases can help an investor decide which phase of the business cycle an economy is in. Based on this understanding, an investor can optimize his/her portfolio. In effect, business cycle investing is a strategy that aligns investment decisions with the macroeconomic environment. Different sectors behave differently during different phases of the economy.