NEW YORK (MainStreet) - What's happening in small business today? 1. How to get a cash mob into your store. A movement is underway to bring so-called cash mobs to local businesses across the country. Cash mobs are modeled like "flash mobs," but instead of a group of people breaking out into synchronized dance in a train station, they visit a struggling small business and boost sales by agreeing to spend at least $20 at that retailer.