Some people would say that unions promote laziness in workers, and that in turn, reduces productivity. Is that valid?
I was a union member for 32 years. I disagree with your statement.
For 20 of those 32 years, I was a meter reader. Our productivity was closely monitored, more so, in my opinion, that in the private sector. If we did not get a certain amount of work done, there were consequences.
Whereas, paying someone minimum wage does not promote high productivity. Some tend to put minimum effort into jobs like that and are quicker to walk away from it as soon as something better comes along. I realize I'm generalizing here, but I have seen it in my present job working in a retail store.