We consider the sharing of the cost of producing a homogeneous good when the technology has variable returns and individuals have arbitrary demands. We give a full analytical description of the family of costsharing methods that allocate costs in proportion to demands when returns are constant,...

Indivisible units are produced with increasing marginal costs. Under average cost, each user pays average cost. Under random priority, users are randomly ordered (without bias) and successively offered to buy at the true marginal cost. Both average cost (AC) and random priority (RP)...