Actually, the website from which I gipped that one-time $10,000 dollar investment chart was showing the chart as the follow up to an anecdote about a theoretical one-time investment in 1932.
For the first 4 quarters the $10,000 would have lost 69% of its value but, if the investor had stayed in the market, it would have realized an average of over 14% over the next 29 years...finally being worth a half million in 30 years. $10,000 is less than $250.00 per month for 10 years so, let's say you start at $250.00 a month and in 10 years you have $30,000. If you left it alone, it would historically realize at least 12-14% but, if you keep investing $250.00 per month for another 30 years, it would be over a million.
Also, inflation only devalues the money. It's still a ing million dollars or more. I wasn't talking about buying power.