The clear trend since the 90s has been for productivity to increase while compensation has remained more or less static.
Larger corporations absolutely can afford to pay more - much more. They choose not to, because the institutional narcissism of business culture in the US is set up to gouge employees to the maximum possible extent, not to consider employees as contributors/partners who deserve decent compensation for their contribution.
Wages are therefore constrained so that a profit is left after the worker has been paid. Ignoring other costs, profit is equal value produced minus wage paid.
I understand how they create most value for themselves, they earn more than the other employees and are more likely to own stock options.