The poor racoon you see above is Tom Nook. Though he never says it, he wants a bigger shop. To help him get a bigger shop, you've got to buy things! For each shop upgrade, you need to spend at his shop the number of bells shown under each image below. For the last upgrade, the Nookingtons, you'll also need a friend to come to your town either through WiFi or a DS to DS link and have him/her buy anything out of Nook's shop. I'll be adding a WiFi guide later, and you'll be able to
Click here when it's done. Happy Spending!