A $15 national minimum wage doesn't look economically sound to me

[Igel]

68. But let's not do double accounting.

The productivity gains that produce cheaper dresses should result in increased rewards for those who made the dressers cheaper.

If productivity rewards were allocated "properly," the dresses wouldn't be cheaper.

Meaning you want to reward the retail clerks on the backs of the workers who produce cheaper dresses. Assuming that they're cheaper though productivity increases.

Alternatively, you want to reward retail clerks on the backs of 3rd world workers.

The productivity argument always fails to account for allocating productivity gains or confusing cheaper prices with necessarily resulting from productivity gains. This argument takes the context as independent from all other facts when were the argument applied consistently the context would be radically different--and the conclusion you'd get from the argument would often fail to be valid.