Opportunity Cost
The value of the best thing you give up when you make a choice.
Every dollar spent is a dollar not invested, and every dollar invested is a dollar not spent — that trade-off is opportunity cost. It's one of the most useful mental habits a kid can build: not 'can I afford this?' but 'what am I giving up to have it?'
Explain it to your kid
"What you give up when you choose one thing over another."
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MemoryBank is a display and education tool, not a financial advisor. Nothing here is investment, tax, or legal advice.