This document provides an overview of basic economic concepts including: 1) It distinguishes between macroeconomics, which focuses on broad economic trends, and microeconomics, which examines individual economic decisions. 2) Game theory seeks to understand strategic decision making and how individuals and groups interact in different scenarios like zero-sum, negative-sum, and positive-sum games. 3) Some foundational principles are that individuals act purposefully according to their subjective preferences to achieve their highest valued goals, and the law of diminishing marginal utility explains how additional units of a good provide less additional utility.