The variables in the lemonade stand game were the prices of ingredients in the lemonade, the amount of those ingredients you put in the pitcher, the weather, the demand for lemonade, the amount of people selling it.

The constants are the amount of cups you have per pitcher, the placement of your stand.

The perishables are the lemons, the sugar, ice, and the people.

A perishable is something that can go bad so that you can't use it or it's not desireable anymore.

I got that entrepreneuring in lemonade stands sometimes does not yield as much of a profit as you would like because of the price of your ingredients and the weather.