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299' changes in the composition of the lands. Accuramulation of capital and the use of machinery in agriculture. The growth in the productivrty of agriculture. Diagram s. The index of the gross income of agriculture in real dollars. Diagram 6. The index of the gross income of agriculture per capita of the rutral population, in real dollars. The uninterrupted growth in the productivity of labour in connection with the growth of the real wages. The dynamics of agricultural exports. Diagram. 9; The aggregate export of agricultural produce in real dollars. Dia­ gram 10. The share of the aggregate export in the gross income. Diagram 11. The share of agricultural exports in the general export. Changes in the purchasing power of agricultural pro­ ducts. Diagram 12. The purchasing power of agricultural pro­ ducts according to the weighten index issued by the Department of Labour. In order to judge by the purchasing power as to the dynaniics of the costs of production in agriculture, it is necessary to weigh. the agricultural index .not by exchange weights, but by production weights, or to make use of the unweighed index. Diagram 13. The purchasing power of %ri- cultural products according to the unweighed average of Hannsen. Diagram 14. The purchasing power of agricultural products in ■Europe.^.':;. \ Chapter 11. The Evolutionary Mechanism of Agriculture as Exemplified in the United States ; ^ Changes in the combination of productive factors of agri­ culture. Intensification of agriculture, and the methods of its statistical mensuration. Relying upon the principle of costs in mass production, it may be asserted that during long periods there is a high state of correlation between the gross income and the outlay per acre. By calculating the gross income per acre and carrying out an analytical equation of the curve, we obtain a fairly accprate index of intensity. Diagram 15. The index of the gross income of agriculture per acre in the United States (in real dollars). Chart 42. Changes in the volume of the gross income of agriculture in the United States per acre during th e : : years 1870—1920 (in real dollars, taking 1870 as 100). Chart 43. The same for the period of 1900—1920. . - The picture of agricultural evolution as presented in modern ; German agricultural economics. ' According to this theory the necessary postulate to ,intensification is a relative'increase in the prices of agricultural products. This theory distorts the connection between price-forming and the organisation of agri­ culture and is of no real worth, since it substitutes for The real development of agriculture a mechanical conception built upon. Электронная Научная СельскоХозяйственная Библиотека