Trust is a pre-requisite for employee loyalty and employee loyalty leads to greater profits. This is not news. You'll have lower recruiting and training costs, to start with. Then, as folks stay around, they get better at what they do. That means greater efficiency.
Loyal employees are also the key to the current management holy grail-great customer service.
Knowledgeable, competent folks who care about your company are the ones who tend to go the extra mile for your customers and for you. But they won't be loyal if they don't trust you. Losing trust is something that happens, it seems, while you're doing other things. Those things look important. They're supposed to make the business better.