WORLD HISTORY

Detailed explanation-1: -As economists writing in the 18th and 19th centuries, Adam Smith, David Ricardo, and Thomas Malthus wrote about theories which would continue to influence economic theory in modern times.

Detailed explanation-2: -David Ricardo was an 18th-century English economist renowned for his contributions to economic theory. He developed the comparative advantage theory, labor theory of value, and the theory of rents, which have founded other schools of thought and form the basis of current economic policies and decisions.

Detailed explanation-3: -Adam Smith was among the first philosophers of his time to declare that wealth is created through productive labor, and that self-interest motivates people to put their resources to the best use. He argued that profits flowed from capital investments, and that capital gets directed to where the most profit can be made.