This comment is in reference to the solution to Problem 1, part B. The figures I listed have net welfare loss as $50,000. I took this from the solutions manual for the text book. I do not believe that there is a net welfare loss of $50,000. Given that the two components of DWL add to $20,000, the additional $30,000 must be due to the revenue effect. However, since the problem explicitly states
"
Assuming that Venezuelan import companies organize as buyers and bargain favorably with competitive foreign exporters, what is the overall welfare loss to Venezuela as a result of the quota? "
i feel that the revenue accrues to Venezuelan importers, so that revenue benefits Venezuelans. Hence the net welfare loss should only be the DWL, $20,000.
See Carbaugh, pp. 157 last paragraph, and p. 158, first paragraph.
I apologize for any confusion.
(Thanks Rosine for the clarification.)
Hint on test problem #1: It's probably easier than you think. The argument is exclusively from the point of view of the domestic / importing country.