The increasing commercialism of Christmas can be used to illustrate the concept of inflation. In The Grinch, one of the Whos shows the Grinch a new flyer that the mayor is anticipating that Christmas in Whoville will be three times bigger than last year! In a similar manner, inflation can devalue money and cause people to spend an increasing amount of money each year to keep up with the past. A specific set of Christmas decorations won’t be valuable as the previous year since everyone is expected to do things three times bigger this year.
Thanks to Mandy Mandzik for the clip recommendation. Check out her working paper, All I Want for Christmas is an A on My Econ Final: A Holiday-Themed Review Class, for more Christmas-themed economics examples.