So why hasn't the PAN government made any effort to priviatize the oil industry?
Because it can't. Nationalization is written into the Constitution, and the idea is opposed by other parties and PAN doesn't have majority in either chamber of Congress. PAN has repeatedly tried to push through modest ideas on private capital investment in the industry, and has been rebuffed every time. When Fox first became president, he appointed a few businessmen to the Pemex board - and was forced by the Congress to rescind the appointments within a week. It's a point of national pride, you see
. The sad thing is, everybody knows something has to be done, but nobody dares touching the taboo. A few months ago Cuahutemoc Cardenas (the son of the late President Lazaro Cardenas who did the nationalization and the founder and the former standard-bearer of the PRD) tried sending a baloon that something must be done about foreign investment, but even with all his credentials it didn't fly: within a day he was forced to come out publically saying he was being "misunderstood".
Forget oil. Take electricity. The national monopoly is so inefficient that a) electrical subsidy is one of the government's major expenditures, dwarfing most other social programs b) despite the subsidy, the consumers still pay MORE for electricity than in the US c) the supply is so erratic, that when the other candidates were debating energy policy, Lopez Obrador, who was staying at his home watching the debate on TV, couldn't watch this very part: his area lost power (in this season it happens a few times a weak in most neighborhoods of the capital, poor or rich alike). Still, when PAN tried to change the Constitution to allow private investment, the bill was declared dead on arrival in the Congress.
Yes, for those who do the spurious comparison between Mexico and Bolivia - Bolivia has always been dramatically poorer than Mexico, whatever the legal status of whatever industry. You might be unaware of it, but Bolivia nationalized oil before Mexico did, and Bolivian energy sector remained in state hands until quite recently. The sum total to show for this is: no development in the sector whatsoever. It is only fairly recently (less than 20 years ago, I believe) that the sector was opened to foreign investment - and, in consequence, began to generate revenue for the nation. Furthermore, unlike Mexico, Bolivia simply does not have enough resources, either material or human, to develop the sector without the foreign participation. Assuming Brasil lets them (which I doubt - this would mean Lula letting his opponents in this year's election exploit his "national betrayal"), they might get to enjoy the benefits of exploiting the existing production capacity, but longer term little new development is likely - with high probability they are simply killing the golden goose.