Macroeconomics movements such as the business cycle affect all markets and thus a business owner should know macroeconomics. For example, if the economy seems like it might be slowing down, it might not be wise to take out a large loan for a big expansion. You also can use information about macroeconomics to determine the wages potential hires will accept. If the economy is running at near full employment, you will have to offer higher wages. Another large advantage is the knowledge of monetary policy. The Federal Reserve influences interest rates and knowing what their actions will likely be in the future is very important for businesses. Overall, macroeconomics helps a business owner plan how to allocate their resources better which will increase profitability.