The topic has come up in another thread, and deserves its own thread.

Who do you think holds the power in the therapist-client relationship?

I am talking here about the traditional therapist-client relationship: not inpatient, but people who have regular sessions, etc.

I am not talking about:

-inpatient mental health services
-psychiatrist relationships, given the power of an MD to prescribe medications and hospitalize
-situations in which a therapist might be testifying in court in relation to the client's affairs, e.g., a custody case

So in a "normal" therapist-client relationship, who holds the power?