maps/tradeship/../../mods/content/merchants/datums/merchants/inventory_strategies.dm

/decl/merchant_inventory_strategy	Controls the behavior of merchant stock availability and rotation.
/decl/merchant_inventory_strategy/offer_everything	Makes everything be on the active list unconditionally, i.e. they will always sell (or buy) everything they could. Use with care for merchants that offer or want a lot of different things.
/decl/merchant_inventory_strategy/legacy	Attempts to mimic the old merchant inventory behavior, but reaches the terminal state instantly instead of over time.
/decl/merchant_inventory_strategy/rotate_over_time	Shifts a number of items between the two lists every so often. If the merchant is allowed to exist for long enough, they will eventually complete a full cycle and bring back things they 'put away', and vice versa.
/decl/merchant_inventory_strategy/percentage	Moves a certain percentage of items to the active list on merchant init, permanently.