Turn three reasons to stay out into one deal no one leaves.

You are the deal designer. Use non-cooperative analysis for proposals and refusals, then cooperative analysis for coalition value and allocation.

SOLODeterministic NPCs

CHOICES3 interviews + deal + allocation + 3 shocks

TIME12–18 min

Open the starter glossary

Outside option = value without joining. Participation constraint = deal payoff at least as high as that option. Blocking coalition = a pair that can do better on its own.

Ren the banker, Sara the pension investor, and Yui the operator negotiate nature-finance conditions — All three are rational. Change the conditions.

Ren

Community bank

Expand transition lending without losing clients

Fear: Tightening first and losing clients to another bank
Outside option: 14

“Even the right loan cannot last if I move alone.”

Sara

Pension fund

Verifiable nature outcomes and durable returns

Fear: Cherry-picked and incomparable nature data
Outside option: 13

“I can wait for nature if improvement is verifiable.”

Yui

Operating company

Invest in nature while keeping operations running

Fear: Running out of cash before improvements arrive
Outside option: 12

“If the company stops, nature improvement stops too.”