News you want to use week 45.

The e-commerce giant is putting Instacart, Walmart, and Target on notice. Amazon is rolling out free grocery delivery to Prime members, raising the bar at a time when competition is already at a high point. Prime members will get free, two-hour delivery from AmazonFresh and Whole Foods Market included in their subscription. Earlier this year the company launched one-day delivery on all Prime packages — an initiative that cost the company $1.5 billion — and a 9 percent drop in its stock price last week.

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