1,700 words to say that the difference between price and bribe is mainly semantic. Not a very efficient way of arguing, especially for a neo-classical hack.
But besides this, he is basically correct. My only bone contention is that he misreads the connection between trust and bribery - in societies where bribery is widely spread and expected - it build public trust rather than depletes it (as he is incorrectly arguing). This is the key function of any system of gift exchange - basically Sociology 101.
Wojtek