Mercari

Build Jungle Scout for second-tier marketplaces (Etsy, Poshmark, Airbnb)

Shaan's thesis: B-class marketplaces like Etsy, Poshmark, Mercari, and Airbnb have far less competition than Amazon. Build seller-tooling SaaS (à la Jungle Scout) on top of them, since the existing tools 'exist but they're not great.'

“So I'm really interested in the second tier or like what I'll call B-class marketplaces. I don't mean that as an insult. I mean it more like if you're in real estate, you're like, oh, do I buy an A, you know, A-class property, which is like it's a modern building, fully leased up, blah blah, or do you go for like an older thing that has upside, right?”

Steal thisFind a big marketplace where the third-party seller tools are weak, then build the 'Jungle Scout' for it.