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Five human tiers per chain compete for one market over Rounds 0–17 - Black Friday hits in Round 7. Retailers announce a sales price each round; cheaper prices win a bigger slice. Every seat sees only its own worksheet and channels - the blindness is the point.
The Market announces demand, sales prices are sealed and allocated, then orders flow up the chain one tier at a time. Deliveries take exactly one round to arrive, and leftover stock is charged holding every round.
Price where margin and share balance, order what you can really sell, and keep the whole chain moving - hoarding upstream or panic-ordering downstream loses the game.