There is no "overall wage". When we talk about supply and demand, we're usually taking about the supply of and the demand for some particular product or service, or "market basket" or products and services. In practice, we use statistical averages or medians, income quintiles... and use longitudinal studies to track a sampling of individuals or families over time.
But, if the supply of currency goes up, by quantitative easing a.k.a. old-fashioned debasing a.k.a. inflation, for instance, then the amount of currency required to purchase goods will increase, i.e. prices will rise. But they don't all rise at once, nor by exactly the same amount or percentage, because some people get the new currency earlier than others. Some people don't become aware of the increase in currency (directly or indirectly) until late in the sequence.
Those who get the new currency first are usually able to buy at pre-inflation/pre-devaluation/pre-QE prices, while those who catch on late, find themselves buying at the higher prices.
Debasement of the currency hurts poor and wealthy alike, but those with closest ties to the issuers of the currency, those who receive the new money first, come out better than most. Those who keep savings through the period lose as its value is eroded. Those with debts win because they can pay their debt with the lower-valued currency.
In this case, the supply of labor is being expanded, the compensation of those in the affected fields drops, their "purchasing power", savings, and retained wealth are eroded (as stuff wears out and they cannot afford to maintain or repair or replace).
OTOH, the reason given for moving manufacturing off-shore was to be "competitive" (with whom?), to hold down or reduce prices. But prices went up from the 1970s to present, and profits and compensation to many executives, and some investors rose. But, at the same time, the Fed and US (and other) governments were debasing the currency and competing for finances, and playing weird games with regulation of financial institutions, so the financial waters were muddied. During which quarters did debasement predominate? During which did reduction in quality of goods predominate? Which goods increased in quality and which decreased? During which did retail price rises predominate?