The startup ecosystem is straight up bustling with companies disrupting retail. These startups are popping up in the space like no other. They range from helping merchants sell more, to enhancing shopping experiences, to improving customer loyalty and increasing repeat purchases.

People are not easily pleased. If you’ve worked in retail for more than an hour, you’ve figured that out. But no matter how cranky a customer may be, there is always something you can learn from them… even if it’s how to keep your sense of humor.