But the second factor, energy efficiency, has been equally important.
Protectionism, not efficiency, has been the driving force.
Programming modern cloud systems for full efficiency has been difficult.
Overall fuel efficiency has been declining as manufacturers produce more light trucks instead of cars.
Efficiency has been boosted by the spread of financial liberalisation through the region.
For 40 years now, energy efficiency has been America's most productive energy resource.
Their efficiency has been so good lately that they have killed off 42 consecutive penalties, a span encompassing 12 games.
Since the nineteen-sixties, when Fama got his start, financial market efficiency has been defined rather differently.
All this efficiency has been aided by keeping the car's weight down and buffing up its aerodynamics.
The heart of that efficiency has been the frontline staff, junior doctors being one incredibly important component.
However, the efficiency has been not desirable.
