One way of defining things is when you inherently let signifcant parts of your life be dictated by trust. Normally there are requirements to earning trust such as being good in a field of knowledge to be able to function as a expert regarding such subject allowing others to skip details.

You can obvoiusly enter into dynamics that other dynamics are not allowed to move into such easily. Science or courts need some level of proof. Military power is dependent on weapon production economies. If you just trust it will be a good thing if you do it you don't need any of those complications.

For example a trust based approach to prisoners dilemma can just have the players cooperate while agents wanting to be game theorethically competent must make up all kinds of excuses to cooperate or suffer contraoperation.