It’s been about a year since oil prices started their historic drop, falling from above $100 a barrel to a bottom of about $45 in March. After creeping back to around $60, prices are shaky again amid news of a nuclear deal with Iran and record Saudi production. And low oil prices are good for growth, right? Cheap oil means cheap gasoline, and the assumption throughout the oil price rout has been that for the U.S. economy, built on consumer spending, cheap gas is all good. In theory, yes. In practice, it’s been tough to find the benefits in the economic data this year. Goldman Sachs estimates that a decline in energy-related investment such as new drilling equipment, caused by low oil prices, subtracted about half a percentage point from economic growth during the first half. That’s a pretty hefty bite out of a growth number that probably won’t […]