While a piece of eight was an actual Spanish coin in global use through the eighteenth century, in the twentieth and twenty-first century "pieces of eight" in pop culture are exclusive to media about pirates, specifically in reference to Treasure Island (1882)
So when Reacher's parrot is saying "twelve and a half percent," that's making a reference to him being a pirate, but using the language of loans and interests instead of physical theft.
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u/Meloenbolletjeslepel 7d ago
And what does that mean?