Answer:
B) Supply and demand.
Explanation:
The theory of supply and demand determines the relationship between the supply of a given commodity and the demand for that good. There are many variables that impact economies at both the microeconomic and macro-economic stages. Production capacity, manufacturing costs such as labor and resources, and the number of rivals have a significant effect on how much supply companies can produce. The number of options available, customer expectations and improvements in the pricing of similar goods have an effect on demand.