Problem
A sudden surplus is either dumped cheap in the market or arrives at the border with no plan.
Module
National surplus is calculated and allocated to each farmer as a proportional digital token (for example 20 kg per tonne), then bought back at the export price.
A sudden surplus is either dumped cheap in the market or arrives at the border with no plan.
For each verified tonne, 20 kilograms of surplus-export right sits in a token wallet. The token has an expiry and a delivery point, and moves only inside the rule.
Verified production becomes quota in the wallet.
See the expiry and the delivery point.
Deliver the lot, or assign the quota inside the domestic rule.

Sample in-app screen
Wallet 7.2 t · expires 1405/09/15 · rule 20 kg per tonne · delivery: West terminal.