The CEOs of GOAT, StyleSeat, Cameo, Faire, Whatnot, and Neighbor join a16z partners Andrew Chen, Connie Chan, D'Arcy Coolican, Jeff Jordan, Katie Baynes, and Anne Lee Skates to talk about the cold start problem,  2020 metrics, growth, and the tricky business of scaling a marketplace company.See more marketplace analysis, including a ranking of the 100 largest marketplace startups & private companies, in the Marketplace 100.