In a new study, McKinsey & Co. mulls the idea of consumer packaged goods companies bypassing traditional retail altogether in favor of a more direct approach. In her report, Priti Joshi notes that several major players did just that via acquisition, such as Unilever's purchase of Dollar Shave Club. But not every company has such deep pockets. Another way to play, is through a set of metrics including: • Gross margin per customer should be at least six times the cost of acquisitio...