My consistent position is that Sraffa and his followers, besides
recovering an alternate approach to value and distribution found
in classical economics and Marx, demonstrated the logical invalidity
of marginalist economics.
Empirical results are irrelevant to questions of logical validity.
Wage curves, as constructed from input-output matrices, are rational
functions with the numerator and denominator both being some high order
polynomial functions. I would have liked to see some more wobbles in
those constructed empirically and more examples of reswitching and
capital-reversing. Nevertheless, the finding that frontiers are
close to linear functions, with only a few switch points, is not
consistent with an emphasis on widespread marginal adjustments.
It is more