http://en.wikipedia.org/wiki/Hyperinflation_in_Zimbabwe
First off, in 1980 when the Zimbabwean dollar was first introduced, it was worth about 1.59 United States dollars.
It was noted on another page that in 2006 a revaluation of the Zimbabwean dollar made it worth 1,000 of the old ones. On that page, it's noted that in August 2008, it was revaluated again, 10,000,000,000 of the old ones worth one new one. The last 2 entries are just insane:
"On 12 January 2009, Zimbabwe introduced the $50,000,000,000 note. [37]
On January 16, 2009, Zimbabwe announced plans for imminent issue of banknotes of $10 trillion, $20 trillion, $50 trillion, and $100 trillion." At the time of printing the $100 trillion bill, that was worth $30 USD. On January 20, it was noted to be worth about $10 USD.
So - as of January 20, the U.S. dollar was worth X old old Zimbabwean dollars...how much?
X = 100,000,000,000,000,000,000,000,000 (100 septillion). Good lord!
So - if Bill Gates was worth $50 billion USD, that'd mean in terms of old old Zimbabwean dollars, he'd be worth 5,000,000,000,000,000,000,000,000,000,000,000,000 of them, or 5 decillion.
And hey, at the rate of their inflation, he'd be adding more commas in no time!
"The Cato Institute's Senior Fellow Steve Hanke released a document estimating Zimbabwe's annualized inflation rate to be 89.7 sextillion percent as of November 14, 2008; by his calculations, between October 24 and November 14, prices in Zimbabwe increased by the factor of 170-200 each week."
We've all got it easy - damn. Imagine that gallon of gas when it was $4 per gallon, and looking 3 weeks later to see it at $32,000,000 per gallon.