Last year I wrote about my teenager who was taking on the responsibility of paying some of his expenses. I’ll update you on that soon in a subsequent post. More recently, my nine-year-old, Henry, asked to borrow $20 to buy a video game. “Sure,” I said. “You can do jobs around the house and payment will be due by Sunday evening. If you don’t pay it back by Sunday night, I will add $2 to what you owe and another $2 every week after that if it’s not paid.”