That's the whole point... the world has changed remarkably in 150 years, yet if you plot a stock market index on a semilogy plot, it looks amazingly straight over that period. It goes to show that over long periods of time across periods of remarkable change, the stock market keeps ticking away.
Haha no that is actually MY point. 150 years in the arc of human existence is still a pretty short period. In that time span humans' impact on the planet has grown exponentially. I'm not sure I buy that the same level of economic growth will be sustainable in perpetuity.
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Exponential economic growth goes back much further than 150 years. There were commodity and equity markets long before the DJIA. You can go back to the early 1700s and still piece together a stable exponential curve. You can go back even farther, although you run into trouble normalizing economies around the 1300s and the 'dark ages'. Agrarian human civilization is relatively recent (even modern human existence), so yes, a trend over hundreds of years can be seen as a significant indication of sustained stable growth.
If you don't believe in continued world economic growth to the point where you're anticipating sub-4 returns over the next few decades, then I guess paying off your mortgage would be a good idea. The problem with this line of thinking is that you're trying to looking at the shape of the world economy 30 years from now through the lens of today. Go to any point in industrialized human history and compare the world economy across a 30 year gap. The point is that we have no way to even guess at what new innovations, technologies, and entire industries will be around 30 years from now, but we
can likely predict that some of the main market drivers 30 years from now will be ones that won't even come into being for another ten or twenty years. When you invest across the market in its entirety, you aren't just betting that today's companies will be running strong 30 years from now, you will be buying a share of
every company to the point where you will pretty much be guaranteed to own a small slice of 'the next big thing'.
This goes back to some of the discussions in the Investor Alley subforum talking about the skewness of the distribution of company market returns. It turns out that every year, a very small percentage of companies provide a very large portion of your portfolio return. The catch is that it's almost impossible to guess which ones they will be for a given year, so you simply buy all of them. I mention this because many people view the market by looking through their own lens of the types of companies available and see a cross section of industry sectors such as 'energy', 'health', 'tech', 'manufacturing', 'communications', 'agriculture', etc. You look at those sectors and you look to the future and you see a relatively bleak outlook for all the sectors you can think about. The problem is that you are implicitly ignoring the set of companies that are going to provide the lion's share of market growth over the next decade, because they simply aren't visible yet. Further, you have absolutely no way of even comprehending the set of companies that will be moving the market 30 years from now. So, you make the mistake of looking at the market as it is today and projecting that the companies you see will not be able to sustain their growth over the next 30 years, which is true, but you ignore the fact that the next phase of the world economy is already out there getting ready to change the world. If you invest in index funds, you
will own a share of that market as it becomes the next great investment class.