higher worker happiness leads to greater productivity etc.
Having them live better also helps the overall economy.
I don't think it should be raised too much, but cost of living increases would dictate it has to go up some.
"Work happiness"? Government mandated pay raises don't generate "work happiness".
Work happiness is doing a good enough job to get a raise from a satisfied employer. I valued every raise I got when I started working for minimum wage stocking shelves as a kid because I earned them.