lurch from one extreme to another

But the worst outcome would be to lurch from one extreme to another without a coherent plan.

Throughout his career he has lurched from one extreme to another, noisy then quiet, a prolific goal scorer then a famine victim, a superstar then a substitute.

Therefore, he said, "what makes sense for an individual - to avoid the risk of underperformance by settling for the average return of a market index - collectively increases the probability that market values will lurch from one extreme to another."