Stocks were flat to slightly higher on Thursday morning, the final trading day of the first quarter. This week's initial jobless claims were 210,000, down from a revised 212,000 last week. Ongoing unemployment was 1,819,000, an increase of 24,000 from the previous week's revised level. The third estimate of Q4 U.S. GDP came in at 3.4%, an increase of 0.2% from the prior estimate. The change reflects upward revisions to consumer spending and nonresidential fixed investment that more than offset a downward revision to