A farmer decides what to plant months before there is a buyer for it, and finds out whether the decision was right at exactly the moment they have the least power to act on the answer — with a perishable crop in hand and a market full of people holding the same thing.
Reserving before the harvest
On the harvest marketplace a lot is listed against the crop calendar with an expected harvest date, a quantity and a price per kilogram. Buyers reserve part of it and pay into escrow now. The money is released when the produce is delivered and confirmed, and if the harvest falls short the reservation settles for what actually arrived and the balance is refunded.
What that gives the farmer is not a higher price. It is knowing, before the season is committed, how much of the crop is already spoken for.
Auctions, where the price is the question
For lots where the value is uncertain — an unusual variety, an off-season crop — the lot can be listed for auction instead, selling to the highest bid at or above a reserve when the auction closes. The reserve protects the farmer from a thin day; the auction captures a good one.
Buying in a group
On the other side, buyers who each want a sack rather than a truckload can commit together through group deals, and unlock a wholesale price when enough of them join. Nobody is charged unless the target is reached.
None of this is new as an idea — forward contracts are older than marketplaces. What is new is that a farmer with a phone can use one without a broker in the middle.