1 The average $1 note retires from circulation after 21 months, while coins kick around for some 30 years. It costs more than three times as much to produce a $1 coin, but government accountants say that switching from dollar bills to dollar coins still makes a lot of sense — more than 50 billion cents a year, to be exact.
2 You may have enough cocaine in your wallet to attract a drug-sniffing dog. Studies indicate that blow can be found on between 70 and 100 percent of US bills. Of course, that doesn't necessarily mean your greenbacks were used to snort the stuff. ATM mechanisms quickly spread the dust across the entire money supply.
3 More and more, investors are trading bucks instead of stocks. Since 2004, the number of currency transactions has grown 71 percent. For long-term profits, your best move is to buy and hold moneys from resource-rich countries like Australia, New Zealand, and Canada. But not the euro — Europe's wunder-coin has to fall ... eventually.
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