The last change of any significance is a drop in the labor coefficient. The size of the decline is not large, but it is sufficient to reduce the ratio of marginal revenue product to marginal cost from 1.17 with the OLS func¬tion to 0.75 in the AC function. The implications are that farmers are using too much labor at the going wage rate, and the exodus of farm labor to the cities confirms that a disequilibrium exists