"My husband doesn't have a head for business," complained Ngoc, the owner of a children's clothing stall in Ben Thanh market. "Naturally, it's because he's a man." When the women who sell in Ho Chi Minh City's iconic marketplace speak, their language suggests that activity in the market is shaped by timeless, essential truths: Vietnamese women are naturally adept at buying and selling, while men are not; Vietnamese prefer to do business with family...