Answer:
c. law of demand
Step-by-step explanation:
In Economics, there are primarily two (2) factors which affect the availability and the price at which goods and services are sold or provided, these are demand and supply.
Demand can be defined as the total amount of goods or services that consumers are willing and able to purchase at a given price.
Law of demand states that quantity of goods or services demanded varies inversely with their price, other things constant or being equal. Thus, the smaller the quantity of goods or services demanded, the higher the price and vice-versa.
According to the law of demand, there exist a negative (inverse) relationship between the quantity of goods demanded and the price of a good i.e when the prices of goods and services in the market increases or rises: there would be a significant decline or fall in the demand for this goods and services.
This ultimately implies that, an increase in the price level of a product usually results in a decrease in the quality of real output demanded along the aggregate demand curve.
Additionally, the law of demand states that, the higher the demand for goods and services, the higher the price it would be sold all things being equal.