As the maps prove, higher density populations have higher costs and lower ones have lower costs. Obviously both states and cities have the option vote in higher taxes for themselves.
The bottom line is that option should still be played: State and city citizens have the option to vote in whatever they like. The Democrats are wrong to continually jam solutions to high density local or state problems across every square inch of the United States of America.
A national minimum wage is just a hidden tax on businesses to redistribute wealth without improving performance. The needs to be a better way than always sticking it to the middle class small businesses.
The problem is that states can't be trusted to do the right thing. At least not all of them. I would agree that it would be preferable to have states and localities establish these standards, but our minority rules system is forcing our hand. I guarantee there will be exceptions that address the major impacts (restaurants, seasonal workers, etc).