International market for some agricultural commodities can be characterized by oligopoly, in which participants behave in a non cooperative manner, provoking marketing disputes. According to this scenario, strategic trade policies have been utilized to as an instrument of market share contents...

The theory of contracts assumes that human nature is essentially opportunistic, and economic agents protect themselves against adverse selection and moral hazard by elaborating contracts. In the case of irrigated areas in the Brazilian northeast, such contracts are not necessarily formal. That...