One Potato, Two Potato

I'm predicting this will be next year's winning book. Mr. and Mrs. O'Grady are terribly poor, so poor they must share everything, even their blanket, their coat, and, each day, a single potato. Then Mr. O'Grady digs up a black pot with the mysterious power to double everything put into it. The O'Gradys are now magnificently rich. Then Mrs. O'Grady falls into the pot and Mr. O'Grady jumps in. The two have everything they need in life, including friendship.

I especially liked how the O'Gradys, after coming into such wealth, took the pot back and buried it again, for someone else to find and use.