Xerox and ACS said business process outsourcing is estimated to be a 150 billion dollar market, growing at a rate of five percent per year. The deal, which will need regulatory approval, is expected to close in the first quarter of 2010. ACS shares soared 16.52 percent to 55.06 US dollars in early trading in New York while Xerox shares were down 14.27 percent at 7.69 US dollars.