And yet they do, and for the most part the adverse selection problem does not cause problems.
This may seem a cynical ploy to expand their business, but some compulsion is needed to get around the selection problem.
Critics have focused on the adverse selection problem, or that the real issue is that schools are just too expensive.
So tell me, dear reader, why is it that buffets do not succumb to the adverse selection problem and cease to exist?
One powerful way to combat the adverse selection problem is to give insurers larger, more diverse pools of customers to deal with.
Astronomers are uncertain if this represents a genuine rarity of systems like our own, or a simple self-selection problem in which our current technology only has the sensitivity to pick up the weird systems.
Mr Heckman confronted the sample-selection problem: in terms of the examples just given, for instance, the effect on the results if the workers who answered the questionnaire differed in important ways from those who did not.
But like many market experiments, these suffer from a selection bias problem: Many of the people who want to buy or use these devices are already more environmentally conscious than average.
Meanwhile Lee Fecklington is still a week away from being ready for selection following a hamstring problem.
This leads to the third problem: selection.
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Second, by including the entire eligible Danish population, which is covered by a national tumor registry, the study avoids the problem of selection bias (that is, people who do not make it into your study for various reasons, including refusal).
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"Consistency in selection has always been a problem for us this season, " Young said.
Consistency of selection has historically been a problem for England in Twenty20 cricket.
The problem: Contract selection is never random but influenced by factors such as fleet size, usage level, types of product and risk aversion.
Part of the problem is the selection of the delegates.
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The GoGear 3 runs Android apps with ease, flipping through the selection of Google programs without a problem.
For Professor Hamilton, this was just one facet of the more general problem of how natural selection works.
Despite a chronic knee problem, King's selection was widely predicted after the Tottenham captain's fine run of form in helping his club finish fourth in the Premier League.
But the "too limited selection" at launch could be a big problem for Ongo, says Ken Doctor, a media analyst.
There is one problem when the interview occurs after the selection decision is made.
"Even if we are confronted with a problem, we must remember that the selection of a leader must be a democratic process, " Information Minister and government spokesman Mike Mulongoti said.
The Gloucester tight-head will undergo surgery on a back problem this week and will be unavailable for selection.
In thinking about leadership selection this way, however, they fundamentally misunderstand the problem they face in choosing a leader.
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We might call this the Wallace problem, for Alfred Russel Wallace, who discovered natural selection independent of Charles Darwin.
The main problem I see for normal people is the upfront cost and the selection of movies.
The 33-year-old was a surprise selection in some eyes as he had not played Test cricket for a year because of a hip problem which required two operations.
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The selection committee at Bloomberg Philanthropies selected Providence's proposal because it takes a new approach to a systemic problem and could be replicated in other cities.
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