Why are business cycles and long-run economic growth key concerns of macroeconomics?

Business cycles and long-run economic growth are key concerns of macroeconomics since they impact the GDP. GDP (gross domestic product) refers to the total output from a country's economy. An increase in GDP leads to a rise in the economic status of a nation. Business cycles impact businesses' profitability, which determines the success of a business. If the business cycle is volatile, the GDP will decline, and if the business cycle is non-volatile, the GDP will increase. On the other side, long-run economic growth leads to an increase in the aggregated supply, leading to an increase in GDP, which impacts microeconomics.