No matter whether we regard the various conditions in tables Ia, Ib and Ic as existing simultaneously side by side in different countries, or as existing successively in the same country, we come to the following conclusions: So long as the price of grain remains unchanged because the yield on the worst, rentless soil remains the same; so long as the difference in the fertility of the various cultivated types of soil remains the same; so long as the respective outputs remain the same, hence, given equal capital investments on equal aliquot parts (acres) of cultivated area in every type of soil; so long as the ratio, therefore, between the rents per acre on each category of soil is constant, and the rate of rent on the capital invested in each plot of the same kind of soil is constant: First, the rental constantly increases with the extension of cultivated area and with the consequent increased capital investment, except for the case where the entire increase is accounted for by rentless land. Secondly, the average rent per acre (total rental divided by the total number of cultivated acres) as well as the average rate of rent (total rental divided by the invested total capital) may vary very considerably; and, indeed, both change in the same direction, but in different proportions to each other. If we leave out of consideration the case in which the expansion takes place only on the rentless soil A, we find that the average rent per acre and the average rate of rent on the capital invested in agriculture depend on the proportions which the various classes of soil constitute in the total cultivated area; or, what amounts to the same thing, on the distribution of the total employed capital among the kinds of soil of varying fertility. Whether much or little land is cultivated, and whether the total rental is therefore larger or smaller (with the exception of the case in which the expansion is confined to A), the average rent per acre, or the average rate of rent on invested capital, remains the same as long as the proportions of the various categories of soil in the total cultivated area remain unchanged. In spite of an increase, even a very considerable one, in the total rental with the extension of cultivation and expansion of capital investment, the average rent per acre and the average rate of rent on capital decrease when the extension of rentless land, and land yielding only little differential rent, is greater than the extension of the superior one yielding greater rent. Conversely, the average rent per acre and the average rate of rent on capital increase proportionately to the extent that better land constitutes a relatively greater part of the total area and therefore employs a relatively greater share of the invested capital.