9 — The wages payable for a normal 48-hour week ! are calculated on the basis of the data supplied by Governments. The figures taken for this purpose are generally those corresponding to the ordinary time rates for adult workers. In determining the purchasing power of the weekly wage so calculated, account is taken of the articles of food ordinarily consumed by a wageearner’s family, and of the retail prices of these articles. In order to allow, at least partially, for the differences in the food consumption of the workers in the various countries under review, a series of typical food budgets has been prepared, one for each of the following groups: Belgium and France; central European countries; Great Britain; southern European countries; Scandinavian countries; oversea countries. The sum total of the quantities in each budget may be regarded as a basketful of provisions, the cost of which is determined by the prices current in the city considered. The cost of the basket constitutes the unit of measure in which the purchasing power of the nominal wage is calculated. The number of times this basket can be purchased by the nominal wage for a 48-hour week, determined as already stated, is then found. By taking as basis of the calculations for each occupation and in each city the cost of the basket of provisions corresponding to a given type of consumption, we get the real weekly wages, in terms of foodstuffs and on the basis of the type of consumption considered, of the workers in the specified occupations and cities. Making the calculations for all occupations, we get a series of averages. The relations between these averages can be more clearly shown by expressing them as index numbers; these are ‘calculated by taking as base the average real wages (=100) in one of the cities considered. In the statistical tables published regularly in the Infernational Labour Review average real wages in London at each date ( =100) are taken as the base. In addition, in order to secure a fixed basis for the monthly comparisons, average index numbers for the various cities are also calculated with average wages in London at 1 July 1924 as base. Finally, in order to facilitate certain ER * Data published monthly in the International Labour Review,