April 27, 2026
How to Teach Your 10-Year-Old About Profit Margins
A lemonade stand is the classic childhood business. But most parents ruin the lesson by subsidizing the operation.
You buy the lemons, the sugar, the cups, and the table. Your kid sells a cup for a dollar, pockets the dollar, and thinks they are a business genius. That is not a business. That is a charity.
If you want to teach your child about profit margins, you have to charge them for the supplies.
The Breakdown
Let’s say the supplies cost $10. Your kid sells 20 cups at $1 each. They have $20 in their pocket.
Before they go spend it, sit them down.
1. **Revenue:** They brought in $20. 2. **Cost of Goods Sold (COGS):** You charge them the $10 you spent on supplies. 3. **Gross Profit:** They have $10 left.
This is the moment the lightbulb goes on. They realize that making money costs money.
Scaling the Lesson
Once they understand basic profit, introduce the concept of margins. If they want to make more money, they have two choices: raise the price, or lower the cost of supplies.
If they raise the price to $2 a cup, their revenue is $40. Subtract the $10 cost, and their profit is $30.
If they buy cheaper cups and drop the cost to $5, their profit goes up.
The Takeaway
When you teach a child that revenue is not profit, you protect them from the biggest mistake new entrepreneurs make. They learn to watch their costs. They learn to value their time. And most importantly, they learn how the real world operates.