10. Cyrus McCormick and the reaper. (Consult an encyclopedia.)

11. The story of a loaf of bread. (Wood, _The Story of a Loaf of
Bread_. Additional material on this subject may be secured by writing
to the International Harvester Company, Chicago.)

12. The story of iron and steel. (Smith, _The Story of Iron and
Steel_, pages 23-126.)

13. Development of business organization. (_Lessons in Community and
National Life_, Series A, pages 169-178.)

14. Economic work of the United States government. (Dryer, _Economic
Geography_, chapter xxxiii.)




CHAPTER VIII

EXCHANGING THE PRODUCTS OF INDUSTRY


74. RELATION OF THE DIVISION OF LABOR TO EXCHANGE.--In the self-
sufficing stage that existed in industry a few hundred years ago,
there was generally little necessity for the exchange of products.
Each family produced most of the commodities which it needed, and
depended relatively little upon the products of persons outside the
family circle.