Supply and Demand

The price of tea, a substitute, decreases

The Surgeon General of the U.S. announces the health benefits of hot chocolate 

Winter starts and the weather turns sharply colder 

Wages of hot chocolate producers increase & the price of coffee (a substitute) decreases

Sellers expect the price to rise next month

Consumer income increases and hot chocolate is an inferior good 

The price of hot chocolate decreases

The price of cocoa beans decreases 

The price of whipped cream, a complement, increases