3. What do the authors allege is the primary deficiency of the original Du Pont formula?
The authors maintain that the original Du Pont formula (see #2 above) failed to adequate distinguish
4. Describe what the authors call their “advanced” version of the Du Pont formula. In what sense
does this revised ratio address the issue specified above in (3)?
The core concept introduced in the advanced version of the Du Pont formula is “return on net
operating assets” (RNOA); RNOA, according to the authors, provides a better indication of operating
performance in the sense that this measure is independent of leverage effects. From a controllability
(i.e., behavioral) perspective, this adjustment is clearly desirable: operating managers typically do not
have control over decisions related to capital structure (i.e., the issuance of debt versus equity
Thus, ROE = (income before interest/assets) + [(RNOA – Interest rate on debt) × (interest bearing
debt ÷ equity)]
Note that with the above specification pure operating performance is represented as RNOA, a metric
that is unaffected by the mix between debt and equity (FLEV) and independent of the spread between
the rate of return on net operating assets and the effective interest rate paid by the company on
borrowed funds. Naturally, however, both FLEV and Spread affect an entity’s return on equity (ROE),
which is obvious from the above formula.
5. What is the relationship between ROI (discussed in Chapter 19) and ROE? What is the
relationship between ROI and RNOA (as defined in this article)?
ROI (return on investment) can be calculated either for a company as a whole or for major subunits
classified for performance-assessment purposes as “investment centers.” In both cases, the ratio is
defined as some measure of earnings (i.e., “return”) to some measure of invested capital (such as total
assets, or average total assets). Thus, ROI = income ÷ assets.
In chapter 19 we did not discuss ROE as a summary financial performance metric for investment
centers. Rather, ROE is a metric that would be of interest to the company as a whole, not its subunits.
In particular, ROE is of interest to common shareholders.
Pont model, and the latter in the “advanced” Du Pont model.
19-23
Education.