I've been in the fast food business for 30 years (an investment). When I bought someone else's failing location, one of the first things I noticed was that his chip rack had 12 varieties to choose from. One of the first things I did was reduce that choice to the five best selling items.
Weekly inventory showed how much of each item we sold. The previous owner would keep in stock things that might only have a few purchased per week. His excuse was only to have variety.
Sales of chips went up about 25% immediately.