NEW YORK (AP) - Customers have been walking away from sit-down chains as convenience and affordability take precedence.

Ruby Tuesday said this week its CEO is resigning, and the chain forecast another quarter of lower sales as it closes locations. It's among several restaurant players that are trying to adapt as people have more food choices all around them.

Those suffering the most appear to be ones where people sit down for waiter service and pay more. Darren Tristano, president of the tracking firm Technomic, says younger people in particular are on the go and want their food to be, too.

One advantage big fast-food chains have is that they're still more convenient and affordable. Wendy's CEO Todd Penegor says he thinks fast food will keep taking market share from sit-down restaurants.