This lecture explores the concept of competition in real estate economics, focusing on the decisions made by different investors when faced with the choice between investing in land or financial assets. Through examples of three investors, the instructor illustrates how the price of land and the rate of return influence investment decisions. The lecture also discusses the limits of arbitrage opportunities in the real estate market and how the competition among investors affects the pricing of land. In conclusion, the lecture emphasizes the importance of understanding competition dynamics in real estate economics.