Mandated minimum wages cause unemployment. They do not help: they hurt. On, the first day of the first economics class you ever take, you learn that if the price of something is higher, people want less of that thing. If labor costs are higher, employers will not be able to hire as many people.
Moreover, the higher a wage is, the higher quality of workers it attracts. Let's say that a person with an MBA can earn $100,000 per year doing the very stressful job of trading on the New York Stock Exchange. Let's also say that a cashier at a supermarket with only a high school diploma earns $20,000 per year.
Now let's say that congress sets the minimum wage at $100,000 for everyone. The MBA guy will apply for the cashier job because he can make the same money with a lot less stress. The supermarket now has a choice: hire an MBA for $100,000 or hire someone with a high school diploma for $100,000.
Their choice is obvious. So the result is unemployment for the very people that the minimum wage is trying to help!! Before, high school grad was making $20,000, now he is making $0. The economy suffers even more because the MBA guy who used to be a valuable asset for trading stocks stopped doing that.
The living wage doesn't apply to all businesses. Think about it--if it's so good, why doesn't it apply to everyone? Answer: it's not so good.