The S&P 500 added 0.3 percent to 1,844.53 at 12:21 p.m. in New York. The equity benchmark’s gains this week have taken it to within half a percent of its record on Jan. 15 and its level at the start of the year. The Dow Jones Industrial Average climbed 33.9 points, or 0.2 percent, to 16,167.13.The question is how far and how fast the rally will continue.The earning seasons has been better than expected,but that alone will not drive the market much forward.