This document discusses how to measure "ecommerce domination" and owning more of the total addressable market (TAM). It explains that the TAM is the overall revenue opportunity available if 100% market share was achieved. To measure ecommerce domination, you compare your company's year-over-year growth to the growth in the TAM. The document cautions that year-over-year growth does not necessarily mean growing the TAM. It provides an example of estimating annual incremental revenue from a new initiative. Finally, it advises comparing your company's performance to search demand trends to better understand how you are performing relative to the market.