Just silliness -- unless your only goal is to shut down private enterprise.

Small example:  Mom and Pop run an shave ice store, and hire mostly high schoolers in their first job.  Mom and Pop work there too, but schedule employees for 16 hours a day, all part time -- no benefits.  To make the math easier lets say they pay average of $10 an hour.

So they have payroll of 112 hours a week, at $10 an hour, for a total of $1120 a week, or $4480 a month -- lets say $4500 to make math easier.

But they also pay 1/2 of the 15% Social security and Medicare taxes -- so that's another $350 month.  

Their total labor costs for a year is around $58,000.

Lets say business is real good, and after they pay their own taxes, Mom and Pop make a profit of $100,000 a year. 

If you double the minimum wage, their labor cost double to over $116,000.   

Rather than $100,000, Mom and Pop now make $42,000 a year.  

This is where owners say "Its not worth it" and close their doors.