10. A rise in the price of corn will not be followed by a rise in the price of other commodities, but by a fall in profits (XXXI, XXXIV, XXXV).
11. An addition of rich land to our island would reduce the price of corn by reducing the cost of raising the total supply of corn; and it would not raise the value of manufactured goods (XXXII).
12. High prices, whether caused by depreciation of money or by difficulty of production, are not a public benefit; in the first case, they are a cause of distress, especially to the working classes; in the second, they are a sign but not a cause of prosperity (XXXIII, XXXIV).
13. Facility of production includes skill and appliances as well as fertility of soil, and in that sense, when suddenly introduced in a fertile country, it would for some time extinguish rent (XXXVI).
14. There is no real distinction between productiveness of industry and productiveness of capital; and in the progress of society both of them will diminish, and rents will increase (XXXVI).
15. Wages do not rise when labour is productive unless the productiveness of the labour gives rise to a new capital that demands new labour (XXXVII).
16. There can be no such demand for new labour unless there is a reduction in the value of food (XXXVII).
17. The only permanent cause of diminished demand for capital is the increased price of food (XXXVIII).
18. Low prices are not necessarily a discouragement to production (XXXIX).
19. The need of cultivating less productive soils is the cause of higher nominal and lower real wages (XLII), and it is the only cause in constant and permanent operation (XLVIII, cf. LXIX).