But the model came into question in 2008 and 2009, when the financial crisis hit.
Martinez's future with Swansea came into question on Wednesday when it emerged that Sunderland are hoping to recruit Bruce.
The market seized up, creditworthiness came into question and defaults due to an inability to refinance soared.
The decision came into question when ESPN released the videotape two weeks ago.
His candidacy came into question after the Central Election Commission said he didn't have enough signatures of support for his application.
The future of bowling night, however, came into question earlier this week.
The result was a seizing up of credit in a variety of markets as the solvency of counter-parties to various transactions came into question.
If when Obama came into office there was a question about whether he was a foreign policy pragmatist or an ideologue, his behavior in his first six months in office has dispelled all doubt.
It also provides the context to finally answer the question that has burned ever since index or passive strategies came into existence: Which is better, active or passive management?
FORBES: Finally, An Answer To The Active Versus Passive Strategy Debate
The fact that vorapaxar came from SGP, and was a key asset at SGP, will partly call into question the value of MRK buying SGP.
But a deeper question forming in my mind as I listened to the Prime Minister came into sharper focus during the interview I have just completed with Mr Francis himself.
BBC: Will Francis report rebuild trust in Stafford Hospital?
Earlier this year, I was in Cecil County, Maryland, a very conservative area, and they came right to the brink of suggesting that students read alternative texts that would put evolution into question.
Nevertheless, as educators in Chicago voted to strike and benefits such as tenure came under scrutiny, the question that study proposed sparked a national conversation and helped turn 2012 into a year in which teacher-bashing became a popular past time.
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