Estimating simultaneous equations system of the world prices of the grains for the period (1961-2002)

The work in this paper estimates the simultaneous equations of the grains for the period (1961-2002).The estimation inevitable dealing with the variables that has direct effects on the world prices of the grains and then adding the economic crises to the system, which is finance and monetary crises, petrolic shocks, wars, and curtness. To estimate we have used limit information maximum likelihood (LIML) and K-Class estimator (K-Class). We depending the results of the last method because it is more accuracy and efficiently with the economic and statistic theory. The (SAS.9) Package is used to obtain the results.