This document discusses the theory of production. It defines production as transforming inputs into outputs using factors of production like land, labor, capital and entrepreneurship. It describes different types of production functions including short run and long run. In the short run, some factors are fixed while in the long run all factors are variable. The document also discusses concepts in production like total product, average product, marginal product, isoquants, isocosts, and the production possibility frontier which shows all combinations of goods and services an economy can produce given its resources.