Delivery rivals elbow their way to Grubhub's table

It's never been easier to get a meal delivered to a front door in the United States with restaurant delivery services like Uber Eats, Grubhub, DoorDash, Postmates and Deliveroo on hand.

But competition is heating up in the online food delivery market as customers put low prices ahead of loyalty.

Grubhub, which also owns the service Seamless, learned that last month when it suffered a big third-quarter earnings miss. Its shares lost more than 40 percent, and analysts downgraded the stock.