Stocks shook off a wobbly day of trading and ended modestly higher on Wall Street, giving the S&P 500 its third weekly gain in a row. The index added 0.2% Friday, led by technology companies and banks. Bond yields fell this week despite reports showing the economy is gaining strength as well as some signs of inflation. The yield on the 10-year Treasury note ended the week at 1.46%. Investors will be closely watching next week’s meeting of Federal Reserve policymakers for their assessment of how much of a threat inflation may poise as the economy emerges from its pandemic-induced recession.