Answer:
Microeconomics 
Macroeconomics
Macroeconomics
Explanation:
Microeconomics studies how individuals and firms make decisions in allocating scarce resources.
Some of the topics studied in microeconomics are :
marginal utility 
Demand and supply 
Elasticity of demand and supply 
Market structures 
Macroeconomics studies the economy as a whole. 
Macroeconomics concepts include:
national income
gross domestic product (GDP)
 inflation
unemployment
The effect of a cigarette tax on the quantity of cigarettes sold studies the microeconomic concept of demand and supply.
The effect of a large government budget deficit on the economy's price level and the optimal interest rate for the Federal Reserve to target studies macroeconomics concepts 
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