Chain Store Against Manufacturers: Regulation Can Mitigate Market Distortion

Contemporary domination of chain-stores in retailing is modeled, perceiving a monopolistic retailer as a market leader. A myriad of her suppliers compete in a monopolistic competitive sector, displaying quadratic consumers’ preferences for a differentiated good. The leader announces her markup before the suppliers choose their prices/quantities. She may restrict the range of suppliers or allow for free entry. Then, a market distortion, stemming from double marginalization and excessive variety would be softened whenever the government allows the retailer to apply an entrance fee to the suppliers, or/and per-quantity sales subsidies (doing the opposite to usual Russian regulation).