On the seventh day of Christmas,
My true love gave to me,
Seven swans a-swimming… Ca-ching! The seven swans are the most expensive presents in the Twelve Days of Christmas song, according to the Christmas Price Index. The Christmas Price Index is a facecious commodity price index tracked by PNC Financial services. To calculate this year’s Christmas Price Index, the PNC researches how much each item costs in the current market. Like any group of goods, shifts in the Christmas Price Index reflect general patterns in the economy.