What is the most important money lesson to teach kids?

What is the most important money lesson to teach kids?
Saving money
-100% (-1 votes)
What things cost
100% (1 vote)
Earning money
0% (0 votes)
Budgeting
0% (0 votes)
The value of coins and bills
0% (0 votes)
Other
0% (0 votes)
Total votes: 0