The construction of demand and supply curves assumes that the primary variable influencing decisions to produce and purchase goods is:

A) price.
B) expectations.
C) preferences.
D) incomes.

Demand and Supply

Fundamental economic concepts that describe the relationship between the quantity of a commodity that consumers wish to buy at various prices (demand) and the quantity that producers are willing to sell (supply).

Primary Variable

A key factor in experiments or models that can be manipulated or measured to assess its effects.

Consumer Incomes

The total income received by consumers, including wages, salaries, and other earnings, that influences spending behaviors and economic demand.