"An increase in the minimum wage will raise workers' incomes, which will increase aggregate demand, which will increase output and employment. So would an increase in union wages."
I remember hearing that argument a lot in the 1970s. You don't hear it as much nowadays, but it still lives on in the underworld of economic ideas.
It's (usually) wrong; but it's not a stupid argument. And you can't dismiss it just by drawing a downward-sloping labour demand curve, and showing how an increase in wages will cause a movement up along that demand curve, to a point with lower employment. The whole point of the argument is that an increase in aggregate demand will shift the labour demand curve to the right.
And (most) firms (nearly) always want to expand output and employment. What constrains firms from doing so is not that wages (and other costs) are too high to make additional sales at current prices unprofitable. What constrains firms is demand. They want to sell more output, and would be able to hire the extra labour needed to produce more output. They just can't find the extra customers to buy more output.
Ask any firm this question: "If I could bring you more demand, at your existing price and quality, would you be able and willing to produce more and sell more?" Most would answer a very enthusiastic "Yes!". That's why they spend money on advertising, for instance.
When I put down the textbook and look out the window I see a world where output and employment are (nearly always) constrained by demand, not by supply. So it seems very plausible to suppose that an increase in wages across the economy, if it raised aggregate demand, would increase output and employment, even if it did raise costs a bit. You wouldn't want to raise wages too much of course. If you did raise wages too much so that marginal costs increased above the price of the good, it wouldn't work, because firms would no longer want to increase output and employment to satisfy an increase in demand.
So, what's wrong with the argument?
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