At the time of his death on October 31, 1931, legendary American inventor and entrepreneur Thomas Edison left behind an estate valued at approximately $12 million. When adjusted for decades of subsequent inflation and changes in purchasing power, this sum translates to roughly $170 million in modern economic terms. Throughout his long and prolific career, Edison earned substantial fortunes from his numerous inventions, manufacturing enterprises, and utility companies. However, it is worth noting that his financial journey was marked by significant volatility, as he frequently reinvested massive portions of his capital into high-risk research and development projects, occasionally pushing his personal finances to the brink of bankruptcy during periods when experimental expenditures temporarily outpaced incoming revenues.