If you are self-employed and want to increase your business, include a business card in every envelope you send out of your house, including payment of personal bills. This way the people you do business with on a personal level will get to know you on a business level. I've also been known to leave a business card with a tip after having lunch in a restaurant. If the waitress doesn't pick it up, maybe the next customers at that table will see it and keep it.