Main Street investors in the United States may soon be a step closer to stocking their retirement accounts with hedge fund portfolios called liquid alternatives, a top executive at the Blackstone Group said. Blackstone has been pushing to get liquid alts on the menu of options for US workers’ employer-sponsored, tax-deferred 401(k) retirement savings plans, and Vice Chairman J. Tomilson Hill said the firm was finally winning over some trustees who approve plan offerings. “We are in the middle of trying to crack the code on 401(k)s and there is daylight because there is demand,” Hill, who runs the company’s...