Most of a "living wage" is from the cost of living. We make living space artificially scarce and then your rent is high but so is the rent on the small businesses that employ people. The restaurant can't pay the waitress more when their own costs have gone up, and the money is going to the landlords rather than the employers.

Likewise, when some megacorps capture the government and monopolize a market, the costs go up on both individuals and all the employers in other markets who are now paying monopoly rents with the money they could have otherwise used to hire more people (bidding up wages) or lower the prices workers pay when they buy their products.

Just asking them to pay more doesn't work when the party you want to pay more isn't the party which is extracting the money, and higher costs are just as much of a problem as lower wages.