Step 1 : Introduction to the question "In the 1920's Charles Ponzi scammed investors using a fraudulent scheme involving which of the following?"
...In the 1920s, Charles Ponzi orchestrated a fraudulent scheme involving international postage stamps. Ponzi promised investors massive returns by claiming he could exploit the differences in currency exchange rates to buy stamps cheaply in one country and sell them for a profit in another. While Ponzi’s plan appeared legitimate, it was actually a scam where funds from new investors were used to pay off earlier ones, creating the illusion of profits. This scheme, which eventually collapsed, became infamously known as a "Ponzi scheme."