What is a main principle of adam smith’s the wealth of nations?
a. the free market system is inefficient.
b. business prospers by finding out what people want and providing it.
c. people do not always get what they need.
d. a price-based system provides few incentives for businesses.

A) Business prospers by finding out what people want and providing it.

Explanation:

Definition of 'Invisible Hand' Definition: The unobservable market force that helps the demand and supply of goods in a free market to reach equilibrium automatically is the invisible hand. Description: The phrase invisible hand was introduced by Adam Smith in his book 'The Wealth of Nations'.

the cost of college has risen faster than inflation for many years.

the high price of student services and administration are two reasons for the rapid increase in cost.

for this case we have the following equation:

we apply distributive property to the terms within parentheses.

subtracting 2 on both sides of the equation: