Some of the biggest high interest rate investments aren't financial products, as you may expect. Instead, they are material objects. Imagine the person who sells an old baseball card they've had since childhood for hundreds of thousands of dollars or the lucky antique "investor" who buys a bowl at a charity shop for little or nothing and then sells it to a collector for thousands.
These lucky finds can yield a lot of interest, but for many people calculating the interest can be tricky.
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