Any Minimum Wage sets a floor for prices of goods and services that depend on people receiving wages. Thus, consumer prices must stay the same or increase.
As an exercise in economic cause and effect, have your students plot the # of jobs going to foreign countries vs the price change in the US Minimum Wage by year.
Then have your students try to explain any correlation they see in 1.) the classroom, 2.) to their parents, and 3.) to the local TV station at a school press conference. Tri-Cornered Hats are optional, of course.
That sounds like a good exercise. I teach in an area once dotted with furniture plants, but since the jobs went overseas they now have 14% unemployment. Tricorn hat might be required, actually.....