It hits profits first and hardest. Raise it significantly and it also causes prices to rise. Raise it to stupendous levels (in the US probably > $40-50 hr) and it eventually causes unemployment.

Realistically speaking, though, most arguments are over minimum wage hikes that only affect profits and won't even have a minimal effect on prices. $10 -> $12 isn't even going to cause prices to rise, let alone have an effect on employment. It'll go straight from profits to paychecks.

I can think of only one instance where raising the minimum wage actually affected employment, actually, and that was because it was set at first world levels in a third world environment.