The Billion Dollar Question
So how much is a billion?
Answer: 1,000,000,000 (one thousand million)
Sub-plot: In American English a billion is 1,000,000,000. In British English a billion used to be, and technically still may be, 1,000,000,000,000 (one million million); but in practical usage British English now treats a billion the same as American English does: 1,000,000,000.
Nevertheless, a British billionaire is still worth more than an American billionaire (slightly more than twice as much at today’s rate of exchange).