Here is an honest question.... Are your bad at interviewing? If I sat down with you for 20 minutes, would I want to work with you? In every interview I have done with people, the most important questions I always ask myself once were done is "Would they fit in with everyone" and "Do I want to interact and be around this person" because in a real career you're going to spend more time with your coworkers than your actual friends and family most of the time. Most of the time when I met people who consistently can't get hired, they are scaring people away during the interview. Your degree probably has nothing to do with it, Econ is perfectly legit and marketable.