the mad market

Given the rumour mill and the generation of computers everywhere it is little wonder that the markets are moving around like a yo yo.People are speculating and selling in panic at the drop of a hat because they don't really know the true worth of a companies share price.The recent ups and downs have shown to me that people are working the markets to force the prices down so margin calls are activated and the real people with money are snapping up the shares at bargain prices.If you want the best Warren Buffett shows that a companies profit tells a thousand stories and that if you know the true value of a companies shares you would not sell as in a future time the shares will be valued higher.Anyone agree?