This Labor Day, working families do not have much to celebrate when it comes to wages and job security. But we can celebrate the fact that the deteriorating conditions of work are finally breaking through into broad political consciousness. Last week, the board of directors of Market Basket, one of the last of the independent supermarket chains, agreed to restore the fired CEO, Arthur T. Demoulas, who had treated workers decently rather than just milking the enterprise for dividends as another faction of this family-owned company has sought to do. An uprising by salaried managers and workers had brought the business to a halt. The Market Basket story is particularly instructive, because it represents how so-called shareholder capitalism puts pressure on managers to destroy job security and decent earnings for working people.