With summertime in full swing in the Northern Hemisphere, many traders and investors are less concerned about markets are more concerned about outdoor activities and family vacations. However, after the unofficial end of summer—the U.S. Labor Day holiday—look for focus of the markets to be on the U.S. presidential election, in which the Democratic candidate who wants to raise personal and corporate taxes is presently enjoying a comfortable lead in the polls, and how the public school systems will reopen. Those matters could be a sobering wake-up call for stock market bulls who are riding high at present.