necessarily wrong, because it is logically invalid, are false."Similarly, Andrew Kliman distinguishes between internal consistency on the one hand, and truth or correctness on the other, at least nine different times. For instance, he writes that the TSSI's ability to eliminate the apparent inconsistencies in Marx's value theory does not imply "that Marx’s theoretical conclusions are necessarily correct. It does imply, however, that empirical investigation is needed in order to determine whether they are correct or not. There is no justification for disqualifying his theories a priori, on logical grounds." Within their criticism of the TSSI's handling of the Okishio theorem, Laibman and Foley claimed that material profit rates predict trends within value profit rates. Duncan Foley specifically, claimed that the profit rates do not diverge really “asymptotically”. David Laibman proposed a tracking theorem critique, where the value rate of profit follows the trend set by the material profit rate. What “do not diverge asymptotically” means is that there is a maximum amount by which the two rates will differ. For instance, if rising productivity growth causes the physical rate of profit to rise from 25% to a maximum level of 50%, while causing the value/price rate to fall from 25% to a minimum level of 0%, the two rates have not diverged asymptotically. It is extremely difficult to see how this result (which is, in any case, specific to Foley’s example) can possibly be construed as confirmation of the notion that the physical rate of profit governs the value/price rate, much less as a confirmation of the Okishio theorem. If the physical rate of profit rises forever, while the value rate of profit falls forever, the value rate is certainly not following the trend of the physical rate, not even eventually. The two critics ultimately rescinded their points: David Laibman claimed: “If a viable technical change is made, and the real wage rate is constant, the new MATERIAL rate of profit must be higher than the old one. That is all that Okishio, or Roemer, or Foley, or I, or anyone else has ever claimed!” Duncan Foley claimed: “I understand Freeman and Kliman to be arguing that Okishio’s theorem as literally stated is wrong because it is possible for the money and labor rates of profit to fall under the circumstances specified in its hypotheses. I accept their examples as establishing this possibility” Footnotes See also Critique of political