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Finally, I called bullshit on her bullshit and instituted a financial incentive program that not only quiets our evenings (and my nerves), it teaches her a bit about saving money and delayed gratification.
Here's how it goes. Every night I place three pennies on Z's bedside table. (It is very important that she is in possession of the pennies; promised pennies do not work nearly so effectively.) Z loses a penny every time a parent has to come upstairs. Once in a while Z decides that a bedside visit from Mom or Dad is worth a penny, but she rarely gives up more than one cent a night.
In the morning Z places her pennies in her penny jar. She likes to take them out and count them up, knowing that when she gets around 70¢ she can buy a candy bar or some gummy bars and pay the cashier with her very own money.
We've been using the pennies for over two months now, and I'm honestly a little surprised it's still working so well. Hopefully I won't jinx myself by blogging about it!
Apparently pennies are a popular incentive. Check out Make and Take's Going Potty for Pennies.