Many economists accept this process as a key cause of some postwar recessions.

Economic hardship was a key cause of these armed insurrections.

Or in terms of quality improvement, a large majority of problems (80%) are produced by a few key causes (20%).

One key cause of civil libertarianism is upholding free speech.

Certain ingredients in dog food are known to be a key cause of allergies.

This decision is regarded as a key cause of the American Civil War.

Some have argued that this has been a key cause of an escalation in political repression by the police.

This is the key cause of middle-class anxiety.

But this money might be better spent by reducing the key cause of domestic strife: the limited economic opportunities for working families.

Some of the key causes of this crisis may lie not in economic ratios but human nature.