A nightclub manager in Las Vegas noticed that his beer cooler at the bar was half empty by the end of the night while his energy drink cooler at the bar was 90% empty (both coolers have the same capacity). As a result, the manager reasoned that he should increase the amount of energy drinks and decrease the amount of beer he ordered from the distributor each week.
Which of the following, if true, would most strengthen the manager's rationale for ordering more energy drinks and less beer?