For those interested, a debate has unfolded (last year really) between Michael Heinrich, Fred Moseley and others in the Monthly Review on the tendency of the rate of profit to fall and is available here.
Crisis Theory, the Law of the Tendency of the Rate of Profit to Fall, and Marx’s Studies in the 1870s Michael Heinrich
Response to Heinrich—In Defense of Marx’s Law by Shane Mage
Critique of Heinrich: Marx did not Abandon the Logical Structure by Fred Moseley
A Critique of Heinrich’s, ‘Crisis Theory, the Law of the Tendency of the Profit Rate to Fall, and Marx’s Studies in the 1870s’ by Guglielmo Carchedi and Michael Roberts
Heinrich Answers Critics by Michael Heinrich