Abstract
Cash crops play a great role in economics of developing countries for it shares in external trade of these countries and in most of its local agricultural industries as well as its nutritional importance and the basic role in social and economic development. Although, producing cash crops had been paid a great attention in developing countries, but it still being one of the most sectors in backwardness because the real tendency to develop it were not based on right and scientific bases because of the multivariate restrictions facing the producers of these crops; in addition, to the lack incentives in both quality and quantity given to them. This study depends on a hypothesis which says that the producing cash crops in developing countries submit to so many restrictions and incentives which contribute in variant effects in producing the mentioned crops.
In order to prove this hypothesis, a sample has been taken from some of developing countries such as Tunisia, Morocco, Egypt, Syria, Turkey, Pakistan, Indonesia and Thailand depending on four types of cash crops: wheat, barley, rice and corn relying upon data of time series in estimating this phenomena for each country.
