The S&P 500 is about to enter its strongest quarter of the year historically, this chart shows
1. S&P 500 could enter its strongest historical quarter soon. 2. The index gained about 13% year-to-date as of third quarter's end. 3. Average fourth-quarter return has been 4.4% since 1928. 4. Market rally supported by potential Fed interest rate cuts. 5. Investors concerned about government shutdown affecting labor data.