The rule — announced late last month by the National Labor Relations Board –- sets new standards for determining when two companies should be considered “joint employers” under the National Labor Relations Act.

It sounds wonky. But essentially, the rule could widen the number of companies that must participate in labor negotiations alongside their franchisees or independent contractors. For example, it might require Burger King to bargain with workers even though most of its U.S. restaurants are owned by franchisees. Or it could require Amazon to negotiate with delivery drivers who are employed by independent contractors.