[byrneseyeview]

No, because that means you're using different metrics to compare the same changes, e.g. "Over the last five years, one of my stocks went up 75%. One went up 100%. One went up 125%." What purpose is served by making the last two numbers a different scale? (If you'd like to stick with the percentage terms, pretend I'm talking about dividend yield and not stock price)

[videophile]

Bad example. The whole discussion is about reporting percentages of percentages.

Look, it's pretty clear that hackers have left the building and let marketroids rush in. Feel free to use your ill-defined metric. If you have the least bit of intellectual curiosity, you'd let everyone know what you'd report when the value goes from 0 to a non-zero value. That is all.

[byrneseyeview]

Yes, the whole discussion is about that. Apparently only marketroids are able to handle multiple layers of abstraction -- yes, you can take a percentage of percentages, just like you can take a percentage of dollars or a percentage of conversions.