Will lower oil prices ever become a net positive?

The magnitude and duration of the slump in oil prices has far exceeded what we originally expected and the longer it persists, the harder it is to argue that decline will ever be a net positive for the US economy. As a net importer of oil, lower prices should have boosted real economic growth in the US. Instead, the hit to domestic investment has been unrelenting, while households still haven’t spent any of their savings.