FOUNDATION FOR ECONOMIC EDUCATION, INC. lrvingt:on-on-Hudson, N.Y. Henry Grady Weaver, Mainspring (Irvington-on-Hudson, N. Y.: Foundation for Economic Education, Inc. 1953) 279 pp., $1.50 paper-bound, $2.50 clothbound. wHY DID men die of starvation for 6,000 years? Why is it that we in America have never had a famine? What Are the Answers? It's incredible, if we would but pause to reflect! Why did men walk and carry goods (and other men) on their straining backs for 6,...