A. Introduction, 188. — B. The theoretical basis of the index, 189. — C. The price and quantity index defined, 194. — D. Structural price and quantity differences, 199. — E. A measure of significance, 200. — F. The comparison of more than two aggregates, 202. — Appendices: I. A. comparison of my estimates of Gross National Product for the Soviet Union and Western Europe with previous estimates, 205. — II A note on the factor reversal test, 205. — III. Iteration-convergence problem, 206. — IV. A numerical illustration of computing the quantity index, 210.