(Houston)

If there was ever a time to take a hard look at investing in oil, this might be it. Black gold just hit an 18-year low, falling under $20 per barrel. Evidently, in physical oil markets, barrels are already changing hands for $10 each. The market is grappling with a price war at the same time as a massive glut of excess oil at a time of sharply shrinking demand.

FINSUM: Two thoughts to weigh here. On the one hand, oil was recently at $63 a barrel (in January), so this is a very substantial fall, which means a potentially great buying opportunity. On the other hand, oil is not nearly as scarce as many thought at the start of the last decade, so it is not inconceivable that prices could stay low for a long time.