Quote from Specterx:
Let's back up; I said "I'd like somebody to show me some data proving that the difference between the 10-year bond yield and the SPX dividend yield has historically been a good predictor of stock market returns."
You then appeared to interpret this as a claim that "treasuries at 0.1% a year are just as good an investment as blue chip stocks at 20%." Of course they aren't; but neither is simply observing the difference in yield sufficient to decide what, if anything, you want to buy with your hard-earned cash. If you want an illustration of why, I'll go back and pull some "stocks are cheap" articles from 2000 and 2007 employing similar 'reasoning' to that used by Goldman in its recent call.
Any division between investing and speculating is always artificial; in practice the lines are blurred. Even a 'real-economy' business investment requires, at a bare minimum, making predictions about the future path of input costs and consumer demand patterns. I'm quite comfortable with seamlessly blending the two when I see fit - and quite convinced that those who refuse to do so under any circumstances, and refuse to admit the artificiality of this belief, are missing a piece of the puzzle.
Ok, firstly it's about earnings yield, not dividend yield.
Secondly, it's impossible to use historical data to prove causation in investment, because one cannot conduct controlled experiments. Any one of many variables could have been contributed to the returns, so we cannot isolate - using data analysis alone - which input causes which effect. To do that, one needs to use logical analysis from first principles. Although I would note that when stocks have yielded more than bonds, they have generally outperformed over the long-run (so much so that this yield edge disappeared for decades).
Basic investment theory shows that investment return comes from the cash you can get from an investment. That comes in the form of cash payments from dividends, retained cash that determine net asset value, and the value of future earnings. Since earnings yield (minus essential spending to maintain competitive position) is an indicator of what cash payments you are likely to receive, or see reinvested in the business, then clearly earnings yield matters to investment return.
Yes, there are uncertainties over future earnings, and over the price the market will pay for those earnings at any given time. But no one is claiming that a higher yield differential between stock earnings yield and bond earnings yield is a *guarantee* of superior returns. It is simply being claimed that the greater that differential, the more likely stocks are to be better value and thus provide superior returns, and the more likely bonds are to be poor value and provide mediocre returns. And that statement of probabilities is all you need to justify putting more in stocks and less in bonds - there are never any certainties in investing and it is not necessary to prove something certain in order to support any investment decision.
The division between speculation and investment is as clear as the difference between thin people and fat people; just because there is a point at which they merge and blur does not mean they aren't substantially different concepts. The fact that a 150lbs woman might be on the border of voluptuous vs overweight does not negate the fact that a 90 lbs woman is thin and a 300lbs woman is obese. Speculation is not investment just because the latter has some risks that can't be fully removed.
For example - paying 3 million to take over a company with 10 million cash and no debt, then immediately liquidating it, would be an investment that requires NO forecasting of future business prospects. Buying Apple calls the day before earnings is a pure speculation and nothing to do with investing. Pretty much everyone accepts that those are two meaningfully different concepts.
The distinction is not artificial, but based on meaningful differences. Investments are based on an intrinsic value floor to secure safety of principal, they try to keep risk conservative and they make money from internal returns (cash yield + change in NAV) and any capital gains are from prices recovering to reasonable estimates of intrinsic value; they are bought using long-term money and if debt is used then it is to a level easily financed by sustainable internal cash-flow, and secured by marketable assets. An investment is generally based on analysis of factors that can be understood and promise a high probability of an acceptable or superior return. Speculations generally do not promise safety of principal, high risk is accepted if reward is expected to be high, they often use leverage or short-term funds, they make money from market returns rather than internal returns, and capital gains are essential and based more on changing investor sentiment than intrinsic value. The uncertainty is far higher, and the wager relies on things that are much less amenable to analysis and reliable forecasts. A speculation can involve selling short, using options, making pure bets, with no way to find intrinsic value; and investment cannot. An investor can make money without there even being a stock market or a price quote - just by collecting the yield. A speculator requires someone else to buy at a higher price (or reverse for a short sale), while an investor can just sit and collect his dividends.