Imagine an investment strategy wherein you might seek out the most successful and valuable companies. We will refer to this as the “big five” portfolio. Further, imagine that this “big five” portfolio bought the five most valuable companies in the Standard & Poor’s 500 index at each year’s end starting in 2000. Imagine further that this process was repeated each year ever since. How might this strategy of buying big and valuable stocks have done? The strategy produced positive returns, but the journey would have been painful and frustrating (chart A, below). Investing in the “big five” at the start…