By Dan Weil Technically, it’s low beta stocks. Beta measures a stock’s volatility compared with the market as a whole. If you’re an advanced equities investor, you’re probably familiar with the beta metric, which measures a stock’s volatility compared with the market as a whole. Some of you also are probably well-versed in the subject of equity-risk premium. That’s how much more return you should get if you invest in stocks instead of risk-free assets like Treasury securities. The equity-risk premium has soared 42% this year. And how are the concepts related? “In a rising equity-risk-premium e…