This document defines key terms and theories related to entrepreneurship. It defines entrepreneurship as the process of creating something new with value by devoting time, effort and resources to it. An entrepreneur develops a business model and is responsible for the business's success or failure. Theories discussed include laissez-faire theory, Keynesian theory, Ricardian theory, Harrod-Domar theory, and innovation theory. Key terms defined include business failure, capital, competition, demand, economics, entrepreneur, profit, scarcity, and venture.