Serious Eats: Talk
Free bar snacks.
i've been to a few european and asian countries where this idea is pretty standard. free bowls of popcorn, olives, fruits and chips while some places will even go as far as serving small cooked items to help customers get through their drinking shifts on the barstool.
i never got why this isn't a thing in north america cause it should be. especially places that make most of their money off of drinks.