But it is a sufficient condition: it happening will lead to a contracting economy.
But sex appeal for the male athlete is neither a necessary nor sufficient condition for endorsement success.
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Money is a necessary but not a sufficient condition for the good life, for happiness and wisdom.
Foote et.al (2009) argue that negative equity is merely a necessary but not a sufficient condition for default.
An increasing, growing, money supply is a necessary but not sufficient condition for there to be economic growth.
Yet, in some respects this effort is a necessary but not sufficient condition for creating thriving urban environments.
To put it more precisely, it follows that seeking or obtaining an abortion cannot be a sufficient condition for moral culpability.
"While a popular SNP isn't a sufficient condition to win an independence referendum, it's almost undoubtedly a necessary condition, " he said.
Good analysts are likely quite skilled at mathematical modeling, but it is a necessary and not sufficient condition for being a good analyst.
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That is a necessary but not a sufficient condition, as the type of rock involved, called carbonaceous chondrite, is found in other asteroids, too.
But rigour alone, unfortunately, is not a sufficient condition for it to be relevant and important in terms of its implications for the world of business.
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The Bottom line: More money may be the necessary, but not the sufficient condition for happiness, measured by the satisfaction that may be derived from daily living.
The arithmetic implies, as a necessary but not sufficient condition to spark EU growth (robust growth abroad is also needed), the euro should drop about 20% against the currencies of its trading partners.
Building capacities in Member States for Open Access is a necessary but not sufficient condition for promotion of OA. Creating an enabling policy environment in Member States for OA is therefore a priority.
Apart from anything else, if the Fed's and the Bank of England's policies of keeping money cheaper than it has ever been hasn't returned the US and UK to better-than-anaemic growth in the past three years, it is questionable whether it will be a sufficient condition for proper recovery in the next two years.
Since pursuing your passion is a necessary -- but not sufficient -- condition for a great career, it becomes logically essential to find your passion as a starting point.
New technologies were a necessary condition for the green revolution, but not a sufficient one.
But although a warm sea is a necessary condition for a hurricane, it is not a sufficient one.
Put it another way: domestic reform is a necessary condition for successful adjustment, but it's not sufficient.
As might be expected given the precarious condition of many state budgets, 86 percent of respondents cited lack of sufficient funds as one of the top barriers they faced in addressing cyber security.
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But the London-based watchdog said it now accepted there was sufficient benefit to justify a green light for the worst-affected patients, on condition that those receiving the one-off therapy continued to be followed.
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