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Comment by legolas2412 | Hacker News Reader

And why has that not been true for Japanese or Greek markets for decades?

Where does 7% come from? It is Inflation adjusted correct? 2-3% profits, 2-3% gdp growth? 2-3% others (growth at the cost of smaller companies, other countries etc). I'm not sure how this is all sustainable.

Looking at Japan, none of them are sustainable, not even Inflation. Even as bank of Japan prints immense amount of money and props up all the assets as liquidity injections.

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Seven percent is the historical return of the US stock market. Other markets have different historical returns. This "comes from" the historical data of US stock prices. Comparison to GDP or inflation rates don't apply.

I might be misunderstanding you.

You said "Seven percent is generally accepted as the expected market return over a period of time sufficiently long enough to mitigate systemic risk, ". Also, When people say "historical return is 7%", they do not say it as a historical fact, but as a forward expectation like you did.

So, you need to provide why 7% is generally accepted, and why not 2%, or 70%.

Comparison to gdp and inflation definitely apply. Business profits in an index grow with Inflation and gdp growth, and stock value is the expectation of future profits discounted over time.

Oh, and generally accepted as in one could cherry pick certain, short time periods and show that, say for three years in the early 80’s, the average return wasn’t seven percent. So, it’s generally accepted that “over some sufficiently long time period” one should reasonably expect to make seven percent when invested in a sufficiently diverse portfolio of stocks because that’s been the case historically

Why seven percent is considered a good rate of return, I don’t know. The answer is partially in the question itself, because that’s been the rate of return of the stock market. That though isn’t exactly satisfactory

Sorry I wasn’t clear. Generally accepted as in “a good return,” or “the best anyone should expect.” There’s no doubt that seven percent is the historical average.

Add to which, to be clear, I'm not defending an economic system that depends on continued growth, nor would I. GDP is and has always been a terrible metric by which to measure economic prosperity. I also do not believe that past performance is a sufficient guarantee of future performance. That said, all of this is orthongal to what has been the historical rate of return of the US stock market.

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