The Dow regained half of what it lost in Wednesday’s plunge as buyers returned to the market. The decline was enough to make stock prices seem attractive again. Yet there was more discouraging news on Thursday: The number of people seeking jobless aid rose to a four-month high last week. A new US employment report is due Friday. ‘The trend seems to be worsening,’ said Peter Cardillo, at Rockwell Global. ‘We’re seeing a little hesitation [by investors] in anticipation of tomorrow’s job report.’ But stocks were helped by news the Bank of Japan will beef up its stimulus program and buy $73 billion worth of bonds monthly.