Zhu Zhu Pets

The demand for the Zhu Zhu Pets (robot hamsters) is huge right now, especially because it is the Christmas season.  The demand curve for this item could change when the popularity dies down after the Christmas season because people will no longer be rushing around trying to get their children cheap, robotic toy animals.  There is no substitute good for the Zhu Zhu Pets because they are made by a small company, and nobody expected them to become this popular so quickly, so no substitutes have been made yet.  The demand could have shifted to the right during this time of year because it is the Christmas season, and Zhu Zhu Pets are a cheap way to get a child a good gift.  After the Christmas season, the popularity could die down, and the demand could lessen, making the demand curve shift to the left for this product.