In 2010, the European (EU) High Level Expert Group on milk proposed the introduction of standard contracts between raw milk producers and processors to improve the bargaining position of producers and to stabilize the market by balancing dairy supply and demand. However, contracts may distort competition and deter market entry of rival dairies. We analyze competitive effects of contracts between dairy producers and processors by constructing a game theoretic model. We show that an incumbent dairy can deter a rival dairy’s market entry by offering an exclusive contract to a risk averse producer.