We are a marketplace with buyers on one side and sellers on the other. Which side is the ICP?
Both eventually, but only one at a time, and it is whichever side is scarce. Pick the constrained side and make it your ICP for now, because the other side will follow liquidity and no amount of marketing will substitute for it. In practice that usually means supply early, defined narrowly (one city, one category, one kind of seller) so you can actually fill a page with real choices rather than a thin national list. The mistake is treating both sides as equal ICPs and running two half-strength go-to-market motions, which is how marketplaces stall with plenty of signups and no transactions.
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Before you can pick a side you need the vocabulary: liquidity, constrained side, multi-tenanting, matching architecture. This is the reference that makes the rest of the marketplace literature readable.
Once you accept that supply is usually the side to define first, this forces the next decision: are you going for everyone, for exclusives, or for a curated set. Each answer produces a completely different supply ICP.
This is the episode where the failure comes first: why Fashnear did not work, and then the step by step of power user analysis, personal WhatsApp outreach and home visits that found the real customer.
IndiaMART started serving overseas buyers, lost that market after 2001, and rebuilt around Indian SME buyers posting requirements. A twenty year lesson in how a marketplace's ICP can flip sides and geography and still work.