How low can it go — and how long will it last? The 50 percent slump in oil prices raises both those questions and while nobody can confidently answer the first question (I will try to in a moment), the second is pretty easy. Low oil prices will last long enough for one of two events to happen. The first possibility, the one most traders and analysts seem to expect, is that Saudi Arabia will re-establish OPEC’s monopoly power once it achieves the true geopolitical or economic objectives that spurred it to trigger the slump. The second possibility, one I wrote about two weeks ago , is that the global oil market will move toward normal competitive conditions in which prices are set by the marginal production costs, rather than Saudi or OPEC monopoly power. This may seem like […]