Answer:
The right answer is:
C) is still debated among many economists as to whether it represents a permanent shift in the economy.
Explanation:
There is no consensus among economists over why the world economy has been experiencing a decrease in productivity after the Great Recession. The discussion focuses of the effects of Great Recession on productivity, but some economists point at the fact that productivity was getting low when it started and if there are other factors influencing productivity, too.