The idea of supply and demand is based on the development of a. business decisions in a thriving economy. b. sufficient products to meet consumer wants. c. governmental laws that regulate the economy. d. business efforts to improve product appeal to consumers.

The answer is B: sufficient products to meet consumer wants.

The law of supply and demand, from classic economics, is the idea that products that a society may deem valuable and desirable will be supplied by a free market economy (ideally devoid of governmental intervention). These two forces, in theory, are said to be correlated and, through what Adam Smith called “the invisible hand”, can find equilibrium or balance.  

a is the final : )

it increase by 12% a year from 1812-1820