Investing in the stock market is all about finding quality companies and holding them for a really long time. But when the financial markets are under stress due to monetary and fiscal realities, selling persists because people need the money to save less liquid assets that are subject to bankruptcy or foreclosure. It always works this way and for this reason, you should consider selling ahead of a complete meltdown in financial markets. It doesn't matter how well the company is run or even how much money it makes, it will succumb to selling, always!

CNBC Interview of Blackrock CIO

https://www.youtube.com/watch?v=FkXl2WG4ujU