Does Instacart deliver $2 billion in value to customers?

What's all of the Instacart grocery delivery buzz about?

The darling of grocery delivery, it seems, is officially Instacart. The delivery service—emphasis on SERVICE (we're talking no inventory, no delivery trucks)—just raised nearly $210 million in a new round of funding. Now that's a way to end a year that saw the service expand into smaller markets, make a deal with Whole Foods Market and gain smaller investment boosts. Grocery delivery made its comeback in 2014 as better models proved their worth and analysts touted growth possibilities. And the...