You could buy
You can buy one of the following:
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Random number tables
"A Million Random Digits with 100,000 Normal Deviates" by Michael D. Rich for £62 (Mex$1,214) from waterstones
Buy all billionaires
You can buy each US-dollar billionaire one of the following items:
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Cups of instant coffee
Cost per cup of instant coffee for £0.05 (Mex$0.90)
Shopping list
You can buy all of the following: