What people can't seem to grasp is if you have NO education you do not deserve to make $15 an hour. If min wage is by some chance raise to $15 an hour then people who have an education and are making $15 will want more so when they get more the ones above them will want more.
That's assuming that the people already making the $15/hr. can see a commensurate increase in their salary. However a company cannot raise everyone's wages by equal proportion throughout the company; at some point, the people making the higher wages will not get as much of a raise, thus making them disgruntled. If you have worked for a company for years busting your behind and some new, unskilled person comes in and starts making just as much as you, you are going to be very upset and may even leave the company.
Take the example of
Gravity Payments.... In April of this year, CEO Dan Price announced that he would enact a $70,000 minimum wage in his company, the rationale being that that income would make his employees less stressed and therefore would have an increase in productivity. At first the news was met with great excitement and praise (esp. from liberal bloggers and pundits) as he was doing what the left wants ALL companies to do -- have the CEO slash their salary and give a nice income for all of their employees. However in a few short months, Gravity was faced with many issues related to this wage increase. Firstly, many of their customers feared that the money would have to come from somewhere, and since that somewhere was most likely to be from increased prices for their services, many of these customers left Gravity to find another competitor to do business with. But what hurt Gravity more than the loss of customers was the loss of some of their best employees. When these top-notch employees saw some entry-level worker get their income doubled while they may have only seen a modest raise in their own, they decided to abandon ship and go to a company that
valued those good employees.
When you impose an artificial minimum wage, you start eroding the benefits of meritocracy. People that see others not worth as much being valued above what they should, it breeds resentment. And if meritocracy is destroyed across the board -- if a country imposes wage rates that all companies have to abide by -- these good workers won't just move to a different company (since the next company will have the same issues being that the mandate is universal), they will just give up. They will either downgrade their own value (by not working as hard, diligently, or intelligently) to match their earning value, or they will simply go into a field where they can benefit from the actual fruits of their labor (like becoming a farmer and growing just enough food for themselves to eat).