Billionaires 7 years ago:
https://web.archive.org/web/20171004002738/https://www.bloomberg.com/billionaires/
Billionaires today:
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These sorts of stats are misleading and can erode the footing of the argument you are making. Showing the numbers adjusted for inflation is damning enough.
We've had around 60% inflation over the past seven years, does it explain all their increases? No.
But not including that information and saying "but number is bigger!" Just makes your argument look weak when it could be statistically sound.