Diversification is for folks who donít know the future - which is all of us. Think of it this way, if you knew the future perfectly would you ever diversify your portfolio? Of course not. You would simply pick the single ticker that was destined to produce the highest return...     

https://www.investmentaccountmanager.com/products/the-purpose-of-diversification-a-review-of-the-past-49-years/