Startups

The most active angel investors over the past five years are overwhelmingly operator-investors who leverage deep experience at companies like Google, Facebook, Stripe, and Microsoft.

Angel investors are usually wrong about which investments will do best; only a third of the biggest winners were rated as high-conviction at the time of investing.

The five most common reasons marketplaces fail are lack of demand-side PMF, lack of supply-side PMF, lack of liquidity, bad unit economics, and scaling too fast.

Companies that create new market categories often lose in the long run to companies that gain a foothold after the hard category-creation work is done, which is why 90% of recent tech IPOs positioned in existing markets.

About half of iconic companies found product-market fit immediately after launch while the other half spent months or years iterating, including Netflix (18 months), Airbnb (2 years), and Superhuman (3 years).

The intensity of PMF pull is a factor of both fit (how good your product solves the problem) and initial market size -- broad markets create sudden pull while niche markets create steady compounding pull.

True product-market fit requires three things: making a product people want, making a profit delivering it at scale, and finding and keeping those people sustainably.

Most marketplaces fail not because of marketplace-specific issues but because of fundamental business problems like not building something people want, too small a market, or inability to acquire users.

Hiring before product-market fit slows you down, while hiring after product-market fit speeds you up, so startups should raise meaningful money only after finding PMF.

A profitable company should raise capital only when confident it can use that capital to attain a higher growth rate worth the tradeoff in dilution.

If your product is broken and people are still using it, that is a clear sign of product-market fit.

Product-market fit is not a one-time discrete event; competitors arrive, markets evolve, and what felt like PMF can fade as patterns change.

When validating a startup idea pre-product, the three things to look for are visible passion in potential customers, willingness to pay now, and a clear articulation of why this problem matters to them.

A late-arriving technical cofounder should receive common shares with standard vesting, with equity ranging from around 10% for a true cofounder up to 1-5% for a senior founding team member.