Macroeconomics is based on principles of micro economy.

• If an individual is studying impact of deflation on the economy (macroeconomics) he is likely to use same economic principles of microeconomics which is elasticity of demand to change in prices.
• Demand and supply in microeconomics forms the basis of aggregate/market demand and supply in the economy.

All these studies of microeconomics have led to successful implementation of the macroeconomics theories.