Peter Minuit

Peter Minuit's arithmetic was catastrophically bad. In 1626, as director-general of New Netherland, he purchased Manhattan Island from the Lenape for goods worth 60 guilders — roughly $24 in 19th-century calculations. What seemed like shrewd colonial bargaining was actually a bookkeeping disaster of epic proportions. Minuit had fundamentally misunderstood both the transaction and basic compound interest.

The Lenape weren't selling Manhattan in any European sense — they were granting seasonal hunting and fishing rights, a concept that didn't translate into Dutch property law. Meanwhile, Minuit's 60 guilders, if invested at a modest 5% annual return, would be worth over $2.5 trillion today. He had accidentally executed history's worst real estate deal, creating a mathematical cautionary tale that wouldn't be fully understood until the 20th century.

But Minuit's miscalculations extended beyond Manhattan. Fired by the Dutch West India Company in 1631 for unauthorized trading, he immediately defected to Sweden, becoming director of the New Sweden Company. His mission: establish Swedish colonies in the Delaware Valley, directly competing with his former employers. This wasn't simple career advancement — it was calculated revenge.

Minuit's Swedish venture succeeded brilliantly until 1638, when his ship Kalmar Nyckel was lost in a Caribbean hurricane during a trading expedition. He died having founded two colonial settlements, betrayed one European power, and created a mathematical problem that would perplex economists for centuries. His legacy wasn't conquest or exploration — it was proof that colonial ambition combined with poor arithmetic could reshape continents.