The tax debate in Washington is heating up, so expect anxiousness among investors. But don’t take your eye off the ball. Liquidity is free-flowing from central bank stimulus, and that’s good for people who expect the stock market rally to continue. Still, there’s been a very important shift: the willingness of investors to assume added degrees of risk has diminished. Reasonably, with the S&P 500 Index SPX, +0.14% Dow Jones Industrial Average DJIA, +0.03% and the Nasdaq 100 Index NDX, +0.40% hitting all-time highs, it’s hard for some people to see the shift. If you invest in small-cap stocks, you see it very clearly. The Russell 2000 Index RUT, +0.18% has been extremely weak lately, and there’s a reason for that.via