01/17/2026
The power of compound interest.
And, the reality that Boston is 500 times better with their money than we here in Philadelphia are. Historically speaking.
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In 1790, Benjamin Franklin left behind more than just inventions and witty quotes, he left a financial time bomb. In his will, he gave $2,000 each to Boston and Philadelphia, but with strict instructions: the cities couldn’t touch the full amount for 200 years.
The money was to be loaned out to young tradesmen at low interest, reinvested, and allowed to grow. Franklin, who started as a teenage apprentice, wanted future generations to have the same shot he did but with compound interest on their side.
Boston took the challenge seriously. Its trustees reinvested wisely, avoided political meddling, and let the fund snowball. Philadelphia… not so much. The fund was mismanaged, raided for unrelated projects, and grew far more slowly.
Still, when the 200-year timer went off in 1990, the results were staggering: Franklin’s original $4,000 had grown to over $6.5 million. Boston’s share alone was nearly $5 million. The cities used the windfall to fund scholarships, vocational programs, and civic projects, exactly what Franklin had envisioned.
But here’s the kicker: Franklin didn’t just predict the power of compound interest, he weaponized it. He knew that time, patience, and smart investing could turn pocket change into a fortune. His bequest wasn’t just generous; it was a 200-year trust fall into the future. And it worked.
Today, economists still cite it as one of the most successful long-term philanthropic experiments in history, a quiet revolution in public finance, launched by a man who once said, “An investment in knowledge pays the best interest.” Turns out, he meant it literally.