Last week, the S&P 500 put an end to its streak of weekly losses, despite giving back some gains on Friday. Thursday provided the big catalyst, with the ECB’s announcement of its bold new monetary stimulus plan. Investors were cheered and soothed for the moment. And U.S. fundamentals still look strong. Read more about Sector Detector: With the Fed fading into shadows, investors look overseas for new catalysts

Bulls are having their way as summer draws to a close. Indeed, U.S. stocks and bonds seem to be the best and safest place to invest in a global economy that is at once hopeful and cautious, with lots of available cash hunting for attractive returns. But now the S&P 500 must deal with the ominous 2,000 level. Read more about Sector Detector: Up next for bulls, a big test of conviction