How do you feel when you meet someone who offers the same services you do? Are you excited to meet a peer, or do you view them as a competitor that you must beware of? Most people will feel either threatened or excited or possibly somewhere in between. Where you come down on this spectrum can be very telling about your general philosophy of business and life.
If you believe that there isn’t enough business to go around you will view other people who offer similar services as competitors. Every client they land is one that isn’t on your roster. You avoid sharing any information that might give a competitor ways to improve their offerings or make their work life easier. You hold your knowledge and your resources close to the vest.