After a commendable run in the first nine months of 2024, the S&P 500 is poised to gain in the year’s final three months. The S&P 500 has risen 20.8% in the first three quarters of the year, and historically whenever the broader index has gained over 20%, it has, on average, risen 2.1% in the fourth quarter, per Dow Jones Market Data.In the October-December quarter, the S&P 500’s median return was as high as 4.1%, and the index gained more than 77% of the time, added Dow Jones Market Data.The Federal Reserv ...