MY dad who had a PHD and was a college dean said the same thing years ago. While that may be true but a lot of the universities only seem to recruit professors

MY dad who had a PHD and was a college dean said the same thing years ago. While that may be true but a lot of the universities only seem to recruit professors from a limited number of universities so the feed back loop is still there -Head of the IU econ department gets PHD from Harvard, hires new professor with PHD from Harvard, how is this different?