Trust is the foundation of any relationship. If you don't have trust, you don't have anything. Make sense?
In business, you have to be trustworthy in order to
a. be trusted
b. be able to trust
I have found in my travels that people who don't trust others are most likely not to be trusted. Well, if I can't trust you then why would I want to do business with you?
If you work for someone who isn't trusting, keep an eye out. You may not be able to trust them. It is the worst way to do business and eventually catches up with you.