1) Traditional startup models assume startups should mimic large companies, but this leads to inefficiencies as startups don't have the same resources as large firms.
2) The Lean Startup model advocates for rapid, low-cost experimentation to test product-market fit through a build-measure-learn feedback loop rather than lengthy product development cycles.
3) New funding models like accelerators and patient capital lower risks for startups by providing early-stage funding and mentorship.