The key factor behind the prevalence of aggressive driving is congestion.
The key factor behind high cost renting is the lack of supply of homes where people want to live.
That was a key factor behind the change, with more families afraid of losing their investment, experts said.
A rise in global technology spending is also a key factor behind the industry's increase, NASSCOM officials said.
A key factor behind the successful launch of professional football was intense coverage by the mass media.
He pointed to the widespread use of legal highs as a key factor behind the increased instability in prisons.
Earlier educational attainment is a key factor behind the gender disparity, the report says, with girls outperforming boys in primary and secondary education.
Pixar's decision to end its partnership with Disney was seen as a big setback for Disney and a key factor behind investor dissatisfaction with Mr Eisner.
We have argued that the weakness of the labour market relating to structural rigidities has been a key factor behind France's underperformance compared with Germany".
"Information technology has been the key factor behind the improved productivity performance," Mr. Sichel and Mr. Oliner write, adding that "a sizable portion" will persist.
The government's independent forecasters expect a slowdown in business spending to be a key factor behind weaker economic growth next year.
