We should be thinking of wages like we think about stocks. The “worth” of a company on the stock market is determined through price discovery. There's no easily determined inherent value of a company, just how much someone is willing to pay for it.
Wages are also set via price discovery. Unless you're part of a union/government with a collective agreement indicating your wages, your salary is what your employer thinks is the minimum they can pay for your skills/education/situation/etc.
But remember, this is a game of price discovery. If prospective employees turn down jobs saying “it's not enough money for me, sorry” then employers will think that the “price” of labour is higher than they initially thought.
This is where we come in.
Even if we aren't looking for a job, or even if it's a job that we're not interested in, we should be applying to these as much as possible and getting interviews. If we get an offer, we should turn it down saying that we need much more money. If enough people add themselves to the interview pool turning down lowball (or even fair) offers, then employers will think that the price of labour has gone up, and will offer a higher wage and/or better working conditions to an interviewee that actually wants the job.
In the long run, this will benefit all workers. Wage increases in one field will have a knock-on effect to wages in other fields when people start making industry shifts for higher salaries. Even if you're currently unionized, higher wages in other areas will make it easier to bargain for salary increases across the board.
So get out there and get yourself offers to turn down. The more of us that do this, the quicker employers will think that the price of labour has gone up. And maybe you'll even get an offer that you want to take! Other than the time spent interviewing and applying, it's a no-lose situation.