1. There are three categories of market entrants: first movers, early followers, and late entrants. 2. First movers have advantages like brand loyalty, technological leadership, preempting scarce assets, exploiting buyer switching costs, and reaping increasing returns. However, they also bear high R&D costs, lack supply/distribution channels, and face uncertainty in customer requirements. 3. The optimal timing of entry depends on factors such as customer preferences, technology maturity, availability of complements, competitive threats, and the firm's resources and reputation. Managing entry timing is complex given the risks of early or late entry.