It's slightly different with Netflix and its recommendation engine. To extend your analogy the grocery store would need to be telling you "Hey shopper, based o

It's slightly different with Netflix and its recommendation engine. To extend your analogy the grocery store would need to be telling you "Hey shopper, based on your personalized history of buying milk we think you'd like to buy cereal." But instead of giving you all of the cereal in the same aisle the store brand cereal is up front and costs the same as the brand names, and all the cereal the store doesn't get a cut on is in the farthest corner.