7. To illustrate trend analysis using the measurements introduced in this chapter.
TEACHING OBSERVATIONS:
1. In our opinion, the return on investment concept is one of the most important ideas that
students should understand about business operations. The ROI concept (using the DuPont
2. The DuPont model can be used to contrast the profitability components of two or more
industries that achieve comparable total profitability. For example:
Margin * Turnover = ROI
Grocery stores 1% * 15 = 15%
Heavy equipment manufacturers 15% * 1 = 15%
Retail jewelry outlets ? ? ?
Get students involved in the discussion by asking them to make educated guesses about the
industry averages for margin and turnover in the jewelry and computer industries. Balance
sheet components affecting turnover can easily be identified by most students—but be sure to
emphasize that the denominator used in the turnover (and ROI) calculation is average total
assets—and not just inventory! Ask them, “Which of the firm’s assets really turn–over, as
such?” Point out that manufacturers make substantial investments in long-term assets (such
3. The impact on an industry that achieves above average profitability can be used to illustrate
the cyclical pattern of industry profitability over time. When industry profits are unusually
high, more firms enter the industry. This leads to increased competition, which leads to