IIRC Sweezy's claim is that the ROP is indeterminate - why privilege a rising C/V over a rising S/V - and hence he views the TROPF as of little use. I think there is a limit to the rate of surplus value and the tendency of the rate of profit to fall is real and will eventually assert itself. This has little do with Kliman and he certainly isn't the first to note this.
I do see Kliman as close to an inverted Sweezy. Firstly, his corn model examples for the TSSI using pre-production costs show a rise in productivity causing a fall in the ROP - as opposed to his simultaneist corn model examples. Yes, he describes the role of an increasing rate of surplus value or the cheapening of the elements of constant capital as counteracting influences but they're not exemplified - at least what I've read so far.
Second, there is Kliman's later empirical work on the rate of exploitation in the US and his claim that the portion of national (US) income going to workers ("total compensation") has risen since the early 1980s, i.e. that the rate of surplus value has actually fallen.
Kliman emphasises the tendency, as others emphasis the counter-tendencies. I agree that the aim is to take all elements into consideration and, crucially, that the balance of influences changes over time.



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Red, I don't see what your point is. Kliman is saying Sweezy believes that a sufficient rise in exploitation can neutralize any fall in the rate of profit. Kliman's point is that there are limits to exploitation. So while this is indeed a counter tendency it won't always neutralize the tendency.
Arguing that there are limits to the counter tendency of rising surplus value is not the same as saying that this counter tendency never manifests itself! Its like you are accusing Mikus or Kliman of some sort of inverted Sweezy argument; where the tendency totally neutralizes the counter tendency in virtually every situation.
I think you miss the point. The point being: to take all these elements of the LTFRP into consideration as a unity.