Keynes assumes that a person's income depends on the consumption of the product being sold, and by extension believes that by not consuming, one is denying a wage earner a wage.

And second, wage gains that accrue to top engineers and financiers in Silicon Valley and New York City mean very little to the median income earner in Cleveland or Phoenix.

If the income difference was very small, being a top earner in the poorer world would probably be more satisfying.