This document introduces real estate economics. It defines real estate economics as the study of how people's actions affect property values using economic principles and analysis of trends, supply and demand, and the link between general economic theory and real estate practice. The document outlines that real estate economics has four parts: basic economic background; understanding real estate markets; major influences on development; and analyzing investments. It presents the "Stairway of Real Estate Economics" showing the progression from basic principles to final real estate decisions.