Doug of d-short fame looks at the above question, and concludes, not so much:
Diversification is a cornerstone of Modern Portfolio Theory and portfolio risk management. We spread our investments across a range of asset classes to ensure participation in the upside and reduce exposure to the downside. This is a time-honored strategy that works … most of the time. But during epic market downturns, asset classes tend to march to the same dismal drumbeat.
Please use the comments to demonstrate your own ignorance, unfamiliarity with empirical data and lack of respect for scientific knowledge. Be sure to create straw men and argue against things I have neither said nor implied. If you could repeat previously discredited memes or steer the conversation into irrelevant, off topic discussions, it would be appreciated. Lastly, kindly forgo all civility in your discourse . . . you are, after all, anonymous.