Last week, the U.S. stock market has seen strong selling activity. The S&P 500 Index has declined about 7 percent from its peak, while the Nasdaq Composite Index plunged more than 10 percent (entering a correction territory), below 11,000, as the chart below shows. It was the tech sector's worst drop since the end of March, if not the quickest correction ever. What did happen? Well, the ultra-bulls would say that it was just a normal correction on the long-term bullish trend. The perma-bears would disagree, claiming that the day of reckoning had finally arrived. But what is the truth? Well, corrections happen from ... (full story)