The cost and complexity of delivering groceries is what ultimately led to the downfall of Webvan and other startups that have tried to disrupt the $600 billion-a-year grocery industry.

But a new wave of promising delivery startups are relying on a tried-and-true model to disrupt groceries: membership.

Membership grocery services help secure consumers as repeat customers and allow companies to lower individual shipping fees on every order. Shipping fees are typically a big barrier to grocery delivery because orders must be delivered fast to guarantee freshness.

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