Product metrics and goals
Marketplace liquidity
Also called Liquidity, Sell-through rate
How reliably buyers find what they want and sellers make a sale, often measured as the share of listings that sell in a period.
How it's worked out
Listings that sold in the period ÷ live listings × 100, or searches that end in a transaction ÷ searches × 100
A marketplace works when both sides succeed often enough to come back. Too few sellers and buyers leave empty-handed; too few buyers and sellers stop listing.
Measure it in a narrow market first, one city or category, where it can actually be reached.
In practice
9,000 of 30,000 listings sold this month: 30% liquidity.
Common mistake
Measuring across the whole marketplace, where strong categories hide the empty ones.