This document discusses the timing of market entry for new products and technologies. It describes three categories of market entrants: first movers, early followers, and late entrants. The advantages of being a first mover include establishing brand loyalty, technological leadership, preempting scarce resources, exploiting switching costs, and reaping increasing returns. However, first movers also face higher R&D costs, undeveloped supply chains, uncertainty over customer needs, and reliance on immature complementary technologies. The optimal timing depends on factors like customer preferences, technological improvement, availability of enabling technologies and complements, competitive threats, and first-mover resources and reputation. Managing entry timing carefully is complex given the risks of an early failure benefiting