Are you a Wal-Mart worker that wants to collectively bargain? Then you might need to move to China. While the world’s largest retailer has a record of ferociously busting unions in the United States, the company this week signed a collective bargaining agreement with the Shenyang City Trade Union. Wal-Mart began agreeing to union representation in China in 2004, as long as the unions were associated with the Communist Party-run All-China Federation of Trade Unions. The agreement provides an annual 8 percent pay increase, paid vacation, and overtime pay. The Chinese union said the agreement reflects Wal-Mart’s commitment to social responsibility.