 Since retail stores cannot choose who their customers are, retail clerks are forced to wait on anyone who walks through the door.While most customers are polite and understanding, a small percentage can be rude, egocentric, demanding, mentally unstable, emotional, or suffer from any number of other types of undesirable traits.Since all retail stores have a goal of earning repeated business, employees will often sacrifice their better judgement or dignity to meet the demands of such customers.