We report results from experimental markets in which two different...water are supplied to two types of consumers; households and farmers. In the...studied, we very strategic complexity (and centralization) by varying the...of agents per market. CentralizationWe report results from experimental markets in which two different...water are supplied to two types of consumers; households and farmers. In the...studied, we very strategic complexity (and centralization) by varying the...of agents per market. Centralization of information by a multiproduct more (scenario I) improves market preformance with respect to a duopoly...downstream coordinator (scenario 3)succeds in mitigating upstream market...In a complex setup like ours, some centralization on the supply or the de...may enhance market efficiency.[+][-]