Boosted by higher oil shares and rebounding tech stocks, the benchmark indexes listed here advanced markedly for the first time in several weeks. Gains were enough to push each of the indexes into the black year-to-date, led by the Nasdaq and the Russell 2000. By last week’s end, each of the indexes posted gains exceeding 2.0%. Not since the week ended April 13 have the indexes listed here posted gains exceeding 1.0%. Investors also may have taken comfort in the presumption that inflation isn’t heading skyward based on the modest increase in the Consumer Price Index. Soft prices may preclude, at least temporarily, the Federal Reserve from increasing interest rates.