When firms can supply several separate markets, collusion can take two forms. Either firms establish production quotas on all the markets, or they share markets. This paper compares production quotas and market sharing agreements in a Cournot duopoly where firms incur a fixed cost for serving...

We analyze reciprocal market sharing agreements by which firms commit not to enter each other's territory in oligopolistic markets and procurement auctions. The set of market sharing agreements defines a collusive network. We characterize stable collusive networks when firms and markets are...

In a Cournot duopoly where firms incur a fixed cost for serving each market, collusion is easier to sustain with production quotas if the fixed cost is small enough, and with market sharing agreements if it is large enough.