A pin lies in wait for every bubble and when the two eventually meet, a new wave of investors learns some very old lessons.
Warren BuffettWe really can say no in 10 seconds or so to 90%+ of all the things that come along simply because we have these filters.
Warren BuffettThe optimum portfolio depends on the various expectations of choices available and the degree of variance in performance which is tolerable. The greater the number of selections, the less will be the average year-to-year variation in actual versus expected results. Also, the lower will be the expected results, assuming different choices have different expectations of performance.
Warren Buffett