Why the quotes around the word "why"?
Productivity increases make goods cheaper. Wages do not necessarily have to rise in order to increase standards of living.
Would that be to put under stress through maximum effort?
Should I queue the Night Gallery music?
Productivity increases make goods cheaper.
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Cheap labor makes goods slightly cheaper, the business owners mark up the price and reap in enormous profits off the backs of the slaves.
Productivity stagnates under slavery.