In this post, I examine two questions: One is whether Heinrich’s critique of Marx’s theory of the tendency of the rate of profit to fall—TRPF—is valid. After that, I will examine Heinrich’s claim that Marx had actually abandoned, or was moving toward abandoning, his theory of the TRPF.
The determination of the rate of profit
If we assume the turnover period of variable capital is given and assume no realization difficulties—all commodities that are produced are sold at their prices of production—the rate of profit will depend on two variables. One is the rate of surplus value—the ratio of unpaid to paid labor. This can be represented algebraically by the expression s/v. The other variable is the ratio of constant to variable capital, or c/v—what Marx called the composition of capital.
Composition of capital versus organic composition of capital
The composition of capital will change if wages, measured in terms of values—quantities of abstract labor measured in some unit of time—changes. For example, if wages fall in terms of value, everything else remaining unchanged, there will be relatively more constant capital and less variable capital than before. The composition of capital c/v will have risen.
However, though less variable capital relative to constant capital will have been used than before, a given quantity of variable capital will now produce more surplus value. All else remaining equal, a rise in the composition of capital produced by a fall in the value of the variable capital will result in a rise in the rate of profit.
Suppose, however, that the capitalists replace some of their variable capital—workers—with machines. Remember, we are measuring the machines here in terms only of their value. Here, in contrast to the first case, we assume the value of variable capital and the rate of surplus value s/v remains unchanged.
Now, more of the total productive capital will consist of constant capital, which produces no surplus value, and less will consist of variable capital, which does produce surplus value. Since here, unlike in the first example, the rate of surplus value has remained unchanged, the fall in the portion of the capital that produces surplus value will produce a fall in the rate of profit.
In order to differentiate between these two very different cases, which produce opposite effects on the rate of profit, Marx called a rise in the composition of capital produced by a rise in the use of machinery a rise in the organic composition of capital.
Capitalist competition forces the individual industrial capitalists to do all they can to lower the cost price of the commodities they produce. The term cost price refers the cost to the industrial capitalist of producing a given commodity, not the cost to society of producing it. (1) The cost price represents the amount of (abstract) labor that the industrial capitalists actually pay for. It is in the interest of the industrial capitalists to reduce as much as possible the amount of labor that they pay for while increasing as much as possible the amount of the labor that the industrial capitalists do not pay for—surplus value.
The cost price of the commodity is, therefore, the capital—constant plus variable—that industrial capitalists must productively consume to produce a given commodity of a given use value and quality.
As capitalism develops, the amount of capital that is used to produce a given commodity of a given use value and quality progressively declines. But capitalist production is a process of the accumulation of capital. Leaving aside temporary crises, the quantity of capital defined in terms of value must progressively increase over the life span of the capitalist mode of production.
Therefore, the fall in the capital used to produce the individual commodities must be compensated for by a rise in the total quantity of commodities produced if the value of total social capital is to grow. Outside of crises and a war economy, the history of capitalist production sees a continuous rise in the total quantity of commodities produced. This is why the capitalists must find new markets or enlarge old ones if capitalism is to continue. Contrary to Say’s Law, the increase in commodity production does not necessarily equal an increase in markets.