Sam Altman discusses the common question investors ask about market size, arguing that it's more insightful to consider how a market will grow rather than its current size. He emphasizes that the best markets for startups are small today but are projected to grow significantly in the next decade. Altman highlights that successful startups often capture a significant share of a niche market early on, citing examples like Airbnb in the apartment market and Stripe in payment processing.
