E-commerce turning to fee-based memberships

Amazon Prime is probably the most well-known e-commerce membership shopping program, but other retailers have been implementing similar programs that demand up-front fees. Google, Instacart, Jet and Sephora all have a members-only program for online shoppers that gives consumers added bonuses in exchange for an annual fee. Although these programs offer challenges to retailers—think free delivery costs—they also increase customer spending. Story