D. Participating States ................................... II. METHODOLOGICAL ISSUES ...................................... A. Introduction ........................................... B. Construction of price indexes .......................... C. Construction of purchasing-power parities .............. D. Problems specific to military expenditures ............. III. COLLECTION AND TREATMENT OF DATA ........................... A. Introduction ........................................... B. Operating costs ........................................ 1. Collection of data ................................ 2. Treatment of data ................................. 1 - 23 1 - 14 15 16 - 21 22 - 23 24 - 44 24 - 25 26 - 34 35 - 42 43 - 44 45 - 98 45 - 54 55 - 74 55 - 64 7 7 10 10 11 12 12 12 13 16 17 17 18 18 65 - 74 22 Page 4 5 A/40/421 English Page 3 Contents (continued) Paragraphs Pase C. Procurement and construction . . . . . . . . ..*................ 75 - 90 24 1. Collection of data . . . . . . . . . . . . . . ..*................ 75 - 82 24 2. Treatment of data . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...*.. 83 - 90 32 D. Research and development ..a.....................*....... 91 - 98 35 1. Collection of data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91 - 95 35 2. Treatment of data .................................. 96 - 98 36 IV. RESULTS, ANALYSIS AND POSSIBLE FURTHER IMPROVEMENTS ........ 99 - 137 38 A. Introduction . . . . . . . . . ..*.........................*..... 99 - 107 38 B. Price indexes . . ..I...*............................*.... 108 - 116 43 
**Analysis**
The text appears to be a report on the methodology and results of a study on the construction of price indexes and purchasing-power parities, with a focus on military expenditures. It discusses the construction of price indexes and purchasing-power parities, the collection and treatment of data, and the results of the analysis. The text does not seem to be related to any specific sector or industry, but rather is a general report on economic methodology.

**Category**
Economic development, International trade