Are professor wages really a substantial factor in increasing university costs? I don't know too much about the subject but I've always attributed it to (1.) th

Are professor wages really a substantial factor in increasing university costs? I don't know too much about the subject but I've always attributed it to (1.) the wide availability of student loans making it easy for college tuition to rise faster than is affordable and (2.) the crazy amount of expansion/construction/etc. that universities seem to be doing constantly.