How could a union possibly hold up wages without losing hours/employment if they didn’t keep people out?
They negotiate wages and hours with employers? That has an effect on hiring and firing, of course.
@type12error might have meant something along the lines of “money doesn’t grow on trees, where is this extra money for wages coming from if it isn’t being taken out of the budget that would have paid additional workers?”
To which the two-fold answer is – some of it is being taken out of that budget, but some of it is taken out of corporate profits – if the company isn’t producing surplus value, it’ll go bankrupt so it becomes a question of allocation – how many percent go into the pockets of the owner and how many into the pockets of labor? – the stronger a bargaining position labor has, the more of the surplus will have to be paid to them.