This document provides an introduction to engineering economy. It defines economics as the study of how limited resources are used to satisfy unlimited human wants. The three main resources are land, labor, and capital. Engineering economy principles include developing alternatives, focusing on differences, using consistent viewpoints, common units of measure, and considering uncertainty. The engineering economy analysis procedure involves defining problems, developing alternatives, analyzing cash flows, selecting criteria, comparing alternatives, and monitoring results. This process relates to and assists with the engineering design process. Accounting is also discussed as providing financial results after economic decisions are made.