The Magic Jars

The Magic Jars are very powerful for younger children in managing
behavior. Here is how they work:
Get two identical jars. Mayonnaise jars work perfectly. Fill one jar
to the top with pennies. Leave the other jar empty. Place them side by side on
a shelf that is within easy reach of the adult. Each day is for the
child to maintain good control and thereby keep all the money in the full
money jar. When rules are broken, you may either choose to administer a
consequence or reach into the magic money jar and remove a handful of pennies.
Deposit the pennies into the empty jar. At a glance, the child can see how
much they have lost by making the wrong choices.