John Zolidis, president of Quo Vadis Capital, credited all the improvement in restaurant sales in 2018 versus 2017 to delivery, with delivery growing by 9 percent this past year as compared to 4 percent in 2017 and 2016. "The reason why people are gaga for delivery is it's a channel that’s growing," he said. "The reason for that is it feeds into the e-commerce-enabled customer's desire for convenience and customization. With your mobile app, now you can get whatever you want much more easily ... That’s not going away. That trend will accelerate."