Common Sense 2: The Due Diligence Affair
A 1970s Colorado penny stock boom, a wireless-power pitch and Charlie Goodman's common-sense verdict. A due diligence story with a lesson for every investor.
29 Jun 2025 · 4 min read
Investment fraud
The list
One letter, when there is something to say
Charlie wrote to his students. We do the same: a new plate, a chart worth looking at, a note when a book is finished. No schedule, no sequence, no selling to you every Tuesday. Leave when you like.
We keep the list ourselves. It is never sold, rented or shared.