This, I believe, is also the fundamental problem faced by the left today worldwide. In the past, the left could credibly claim that the revolutionary changes in brought about led to superior productivity, mainly thanks to economic planning it introduced, which was superior to "capitalist" planning of the time. But things changed since then, and "capitalists" came with their own version of planning (keynesianism) that is superior to socialist planning. As a result, the left's claim to superior productivity is obviously false on its face, and the only credible claim it has been making is that of different redistribution. Ala, redistribution alone is unlikely to increase standards of living if productivity goes south or even stagnates. . Consequently, the left does not have much to offer anymore beyond questionable Robin-Hoodism a la Chavez. No wonder that few are buying.
So in order to get more political traction the left needs produce its own credible version of superior productivity capable of trumping that pushed by neo-liberals.
Wojtek