I think the minimum wage, the lowest that employers can legally pay their workers, should have gone up in the past 15 years.
I know what you mean. Why is there a minimum wage anyways?
it's a price floor, the bottom that workers may not sell their labor So its to give workers a fair wage, and it hasn't gone up in 15 years, we need it to be enforced.
How can it go up? Who sets the rate?
opinion exist about the benefits and drawbacks of a minimum wage. Supporters of the minimum wage say it increases the standard of living of workers, reduces poverty, reduces inequality, and boosts morale. In contrast, opponents of the minimum wage say it increases poverty, increases unemployment (particularly among unskilled or inexperienced workers) and is damaging to businesses, because excessively high minimum wages require businesses to raise the prices of their product or service to accommodate the extra expense of paying a higher wage and some low-wage workers "will
Minimum wage
A minimum wage is the lowest remuneration that employers can legally pay their workers—the price floor below which workers may not sell their labor. Most countries had introduced minimum wage legislation by the end of the 20th century. 
Supply and demand models suggest that there may be welfare and employment losses from minimum wages. However, if the labor market is in a state of monopsony (with only one employer available who is hiring), minimum wages can increase the efficiency of the market. There is debate about