A move from 12% to 15% can be described correctly in two ways, but the descriptions mean different things. Students exploring the Wharton Global High School Investment Competition benefit from defining the base of every comparison.
This is a fictional financial-literacy exercise, not an official client case, investment recommendation or competition strategy.
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Describe the absolute change in the rate
Suppose a fictional company's profit margin moves from 12% to 15%. Subtract the two rates: 15% - 12% = 3 percentage points.
Percentage points measure the distance between percentages. Calling this a 3% relative increase would be incorrect because it leaves the starting base unspecified.
Calculate the relative change
Relative to the initial 12% margin, the increase is (15 - 12)/12 = 25%. Thus a 3-percentage-point increase is a 25% relative increase in this particular rate.
These descriptions are compatible. They answer different questions: how far apart are the rates, and how large is the change compared with the starting rate?
Do not infer profit without revenue
If revenue stays at 1,000 currency units, profit moves from 120 to 150 units. But if revenue changes, the profit comparison needs that additional information.
For example, revenue of 800 units at a 15% margin gives profit of 120 units, equal to the original 1,000 x 12%. A higher margin does not by itself establish higher total profit.
Try a second comparison
A rate falls from 20% to 16%. The change is a fall of 4 percentage points. Relative to the starting 20%, the fall is 4/20 = 20%.
In general reading, write the original rate, new rate and denominator beside the calculation. Separate a numerical description from a forecast about future performance. Use Wharton's public information for the competition and keep registered-team work independent, following the current rules and school advisor's guidance.
Continue reading: Wharton Investment Competition: Revenue, Profit and Cash Flow.
Wharton prohibits paid competition advisors, education consultants and non-Wharton courses claiming to teach the competition. Students must produce their own work. Use the official rules and your school advisor for questions about permitted support; the contact option here is for public information and resource links.
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Official information and further reading: Source 1
