Answer:
a.- microeconomics
b.- macroeconomics
c.- microeconomics
d.- microeconomics
Step-by-step explanation:
a.- is the campaign of a business it will have impact on that market.
b - this will impact the whole economy as the interest rate determinates projects profitability and unemployment change the labor supply, increasing or decreasing the labor cost
c.- is the price of a single product in a given city It don't impact the whole economy
d.- this is a decision for a given firm. it is not based on a fact from the economy it is being done based on internal decisions.