What matters the most in investing is the time when you exit. Loss or profit depends upon when you exit. If you can identify the bubble bursting, you can safely walk out of the market well before it happens. The tricky question is how to identify the market before it's blowing up. Investors, who made and lost money in dotcom bubble, fear that history may be repeated for the current tech bubble though the damage wouldn't as much as it was in dotcom crash.
Don't put all eggs in one basket - this is basic investment principle in portfolio diversification. But keeping eggs in so many baskets will also not give the desired results, alert analysts.
What happens when a single stock is influencing the performance of several mutual funds (MFs) and exchange-traded funds (ETFs) alike?