The Walras core of an economy is the set of allocations that are attainable for the consumers when their trades are constrained to be based on some agreed set of prices, and such that no alternative price system exists for any sub-coalition that allows all members to trade to something better....

Wage negotiation is modeled as an oceanic game. The employer and unions (if any) are atomic players, interacting with an 'ocean' of infinitesimal individual, unorganized workers. All workers are equally productive inside the firm but may differ in their outside opportunities. The 'worth' of a...