As everyone knows, oil prices have fallen sharply and “unexpectedly” over the last few months, though this is not really unexpected to anyone who believes in markets or technological progress. But confidence in markets and technology does rule out a lot of liberals and virtually all environmentalists. As such, it’s fun to recall his Krugmanness declaring four years ago that “peak oil” was here to stay. In “ Our Finite World ,” Krugman demonstrated that what’s finite is his intelligence and imagination: Oil is back above $90 a barrel. Copper and cotton have hit record highs. Wheat and corn prices are way up. Over all, world commodity prices have risen by a quarter in the past six months. So what’s the meaning of this surge? Is it speculation run amok? Is it the result of excessive money creation, a harbinger of runaway inflation just around the corner? No and […]