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?
politicians are paid to make laws that protect workers and the weakk, thats what they are paid for. , supports of the minimum wage say it increases the standard of living
We need the living standards to go up as prices have risen but wages are low. Do companies follow the set minimum wages?
the full effects of minimum wages.
The movement for minimum wages was first motivated as a way to stop the exploitation of workers in sweatshops, by employers who were thought to have unfair bargaining power over them. Over time, minimum wages came to be seen as a way to help lower-income families. Modern national laws enforcing compulsory union membership which prescribed minimum wages for their members were first passed in New Zealand and Australia in the 1890s. 
Although minimum wage laws are in effect in many jurisdictions, differences of
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