Zhang X. M. , C. H. Shi, J. G. Wu, G. L. Bao, S. H. Ye, T. Katsura, Therelationship betweenessentialamino acidcontentsof hybridized combinations and their parents.
The focus now should be on getting the sum of consumption spending, investment spending, government spending and exports minus imports (C, I, G, and X-M) to a level sufficient to promote growth and full employment.