Del enlace que pegó ayer @Dondinero en el hilo Compounders:La gallina de los huevos de oro (plata también vale)
sobre la Sra. Weiss
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Dividend Yield at or Near Historical Average High
Weiss maintained that the dividend yield moves in cycles, with each stock maintaining its own cycle. The cycle is driven by Weiss’s underlying premise that “when all other factors that merit analytical consideration have been digested, the underlying value of dividends, which determines yield, will in the long run also determine price.”
Dividend yields fluctuate between highs and lows, or “turning points.” These peaks and troughs can be used to establish a channel of undervalued (high dividend yield due to low price) and overvalued (low dividend yield due to high price) price levels (Figure 1). Since the dividend yield is calculated using both price and dividend, the price at each turning point will vary. Weiss’ rule of thumb notes that stocks tend to be undervalued or overvalued when they are within the 10% range of their historical levels of high or low dividend yield. When a stock’s dividend yield is at or above its historical average high, it’s time to buy. When a stock’s dividend yield is equal to or below its historical average low, it’s time to sell. Weiss monitored the dividend yield cycle of the Dow Jones industrial average as a means for analyzing overall market valuations.
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Use Stop-Loss Orders
Weiss felt that sometimes an investor’s worst enemy is himself, not only on the downside, but on the upside. When an investor “falls in love” with a stock, he can’t bring himself to sell it, even if it is overvalued. Her response to this situation is, “It is better to miss a little of the upswing than to lose a lot when the turn comes down.”
Weiss states that the best protection against a significant loss in the case of the market’s sudden decline is to place a stop-loss order at 10% under the price of any stocks in which one has substantial profits. Stop-loss orders are triggered to buy or sell a stock once a specific price level is reached.
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Por cierto si revisan la cartera de la Sra. Weiss en AAII verán que tiene uno de los Risk Index más bajos y con unas rentabilidades consistentes nada despreciables, pero glups pone stop loss 
En fin, como siempre, todos los zapatos no van igual de bien a todas las personas. Cada uno debe encontrar su par ideal