As traders waited for the publication of important inflation data, the S&P 500 concluded Monday's session near the flat line. The S&P 500 finished the day down 0.08% at 4,411.55. The Nasdaq Composite finished 0.22% down at 13,767.74. The Dow Jones Industrial Average gained 0.16%, or 54.77 points, to close at 34,337.87.Investors were looking forward …