(http://mises.org/rothbard/mes/chap8a.asp#2._Effect_Net_Investment)"]
We have seen the impact of new saving, i.e., a shift from consumption to investment, on the prices of goods at various levels. What, however, is the aggregate impact of a change to a higher level of gross savings on the prices of factors? Here we reach a paradoxical situation. Net income is the total amount of money that ultimately goes to factors: land, labor, and time. In any equilibrium situation, net saving is zero by definition (since net saving means a change in the level of gross saving over the previous period of time), and net income equals consumption and consumption alone. If we look again at Figure 41 above, we see that the total income for original factors and interest can come only from net, rather than gross, income. Let us consider the new ERE after the change has taken place to a higher level of saving (ignoring for a moment the relevant conditions during the period of change). Gross savings = gross investment has increased from 318 to 338. But consumption has declined from 100 to 80, and it is consumption that provides the net income in the equilibrium situation. Net income is, as it were, the “fund” out of which money prices and incomes are paid to original factors. And this fund has declined.
The recipients of the net income fund are the original factors (labor and land) and interest on time. We know that the interest rate declines; this is a corollary of the increased saving and investment in the productive system, caused by lowered time preference. However, the absolute amount of interest income is gross investment multiplied by the rate of interest. Gross investment has increased, so that it is impossible for economic analysis to determine whether interest income has fallen, increased, or remained the same. Any of these alternatives is a possibility.
What happens to total original-factor income is also indeterminate. Two forces are pulling different ways in a progressing economy (an economy with increasing gross investment). On the one hand, the total net income money fund is falling; on the other hand, if the interest decline is large enough, it is possible that the fall in interest income will outstrip the fall in total net income, so that total factor income actually increases. For this to occur is possible but empirically highly unlikely.
The one certain prospect is that total net income for factors and interest will fall. If the total original-factor income falls, then, since we have implicitly been assuming a given supply of original factors, the prices of these factors, as well as the interest rate, will “in general” also decline.
That the general trend of original-factor incomes and prices may well be downward is a startling conclusion, for it is difficult to conceive of a progressing economy as one in which factor prices, such as wage rates and ground rents, steadily decline. What interests us, however, is not the course of money incomes and prices of factors, but of real incomes and prices, i.e., the “goods-income” accruing to factors. If money wage rates or wage incomes fall, and the supply of consumers’ goods increases such that the prices of these goods fall even more, the result is a rise in “real” wage rates and “real incomes” to factors. That this is precisely what does happen solves the paradox that a progressing economy experiences falling wages and rents. There may be a fall in money terms (although not in all conceivable cases); but there will always be a rise in real terms.
The rise in real rates and incomes is due to the increase in the marginal physical productivity of factors that always results from an increase in saving and investment.[10] The increased productivity of the longer production processes leads to a greater physical supply of capital goods, and, most important, of consumers’ goods, with a consequent fall in the prices of consumers’ goods. As a result, even if the money prices of labor and land fall, those of consumers’ goods will always fall farther, so that real factor incomes will rise. That this is always true in a progressing economy can be seen from the following considerations.