The rapid expansion of low Earth orbit (LEO) satellite mega-constellations is driving an unprecedented increase in demand for orbital launch services, reshaping both the space transportation market and the broader space economy. This thesis analyzes the deployment dynamics of LEO mega-constellations with a primary focus on quantifying launch demand under different growth and technology scenarios. The study first outlines the strategic and industrial landscape of major LEO constellation programs in the United States, Europe, and China, emphasizing the emergence of satellite systems that function as long-lived infrastructure rather than purely commercial telecommunications services. Building on this context, four deployment scenarios are developed to estimate the number of satellites deployed over time and the resulting mass-to-orbit requirements.