Sales. One component of your profit margin is your sales. Generally, the more coffee you sell, the higher your profit. There are a couple of things you can do to make sure your sales are as high as they can be. First, serve quality products. Second, hire a friendly staff.
Here, Annette Bening is in nerd glasses, those thick black frames that have become increasingly popular over the past 4 years (or so). You can see how her look is instantly transformed from the previous picture, just because of a change in frames. 3 of 19 Show All.
Sunglass lenses, which one is best? For General Purpose use, the Dark Grey/smoke lenses are the most popular. They do not distort colors, they reduce glare to provide day-long comfort, and reduce ultraviolet (UV) light to a safe level.