A convenience store manager noticed that a cooler which had been stocked with only a cola product and an iced-tea product had 15 colas left at the end of the day but only 3 iced-tea beverages
As a result, the manager reasoned that he should increase the amount of iced tea and decrease the amount of cola he ordered from the distributor
On the subsequent day, the remaining three iced tea beverages all sold within the first hour after the store opened.