In the movie "The Day of the Jackal" (the 1973 version, not the remake with Bruce Willis), an assassin who was looking to perform a killing that also would signal his "retirement" as a contract killer hires someone who lived in Italy to create false identification documents (i.e. passports, etc.). He and the document creator agreed that after the assassin had paid for the fake documents, he also would receive all photo negatives and any other relevant materials pertaining to his identity. However, when the assassin showed up to pay for the documents, the professional forger said that he had hidden the negatives, but would give them back for an extra fee - after assuring the assassin that the documents were hidden in a safe place. (Unfortunately for the document maker, the assassin kills him, instead, and hides the body in a trunk located in an out-of-the-way apartment.)

Was the document maker seeking an economic rent, a pure economic rent, or a quasi-rent? Explain. Economically speaking, why would the assassin kill the document maker instead of paying the fee, even though this document maker was reputed to be the best in the world at creating forgeries? (This is not an "honor" killing or something done out of rage or revenge.)