My biggest concern is businesses paying the same amount per hour but cutting people down to 32 hours.
I make $10 an hour working 40 hours I get $400 dollars. Law comes into effect, boss drops my hours to 32 but still making $10 an hour so my check is now $320 a week. Same with salary, they just cut salaries by 20% (new hires and maybe even try it on the people they have.)