Introduction: the importance of consumers' price elasticities and food habits, 596. — Income elasticity and price elasticity, 599. — Demand curves from market data, 604. — New data on low income demand curves: sources, 606; advantages and disadvantages, 608 — The findings: butter, 612; eggs, 615; pork, 616; lard, 618; oranges, 619; grapefruit, 621; apples, 623; prunes, 623; potatoes, 623; white flour, 625; dry beans, 625; rice, 627; comparisons, 627. — Conclusions, 629.