Culture is really just a set of shared values, including things such as openness, sustainability, inclusivity, diversity, and ethical behavior. It can help having these values formally documented so that everyone knows what you stand for.
You may have a progressive open salary policy so that others can't use secret earning information as a tool to pay people less. However, this would need to apply universally, as it's unhealthy to have multiple conflicting cultures because this can precipitate an us-versus-them attitude.
There's plenty more to say about culture, but, as you can see, there are many competing concerns to balance. The most important idea is to make intentional and thoughtful trade-offs. There isn't one correct ...
