Behaviour that may be rational for individual actors can cause chaos if everyone copies it.
Regardless of how much data you have, you need a way to force yourself to be rational.
Markets are supposed to be rational, but it's hard to explain this one.
For some sites, laxity may be rational, since their passwords are not protecting anything particularly valuable, such as credit-card details.
And even if QE has no effect on economic growth, it may still be rational for investors to buy equities.
There's a sense there may never be another chance to do what needs to be done, and that may be rational.
Our strategies must be rational, flexible and sober-minded if we are to chart a forward course rather than be thrown asunder by the coming storm.
If, while he is serving his sentence, he decides to be rational and moral, he will recognize his wrong doing and know that justice has been done to him.
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Be rational, be optimistic if so inclined, but temper it with a commonsensical conclusion that we have seen something similar to this before, and that previous outcomes seldom matched the exuberance.
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Expecting an investor to be rational when they have felt the pain of seeing their savings drop by 20% is as difficult as unlikely as expecting a hive of shaken bees to relax.
Even so, the interesting question is whether it would be rational to merge NHP and Southern Cross, to create a business with more flexibility to cope with unforeseen changes in the economic climate.
Since an agency must attempt to maximize benefits within its budget lest its allocation be revoked or transferred elsewhere, it would be rational for agencies and interested parties to monitor benefits, but Congress need not and should not require it.
None of which is to argue that it would be rational to introduce a financial transactions tax in the European Union and nowhere else: banks and hedge funds could probably avoid it reasonably easily by relocating to Singapore, or Wall Street or Zurich.
To be moved by rational argument, a person has to be open to rational discourse.
It's been on my mind to point out that although there may be a rational argument for placing the holding companies of Liverpool Football Club into administration, that may be technically impossible as of this moment.
The world of men is about competition and risk-taking, but it may be less rational.
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To be strictly rational about it, we should all have ourselves a very Donnie Brasco Christmas.
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In fact there is an agenda out there encouraging us to be less rational.
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For how can there be a rational basis for a ban that has been proven ineffective?
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That means they must think even more, and be more rational (if their goal is life and happiness).
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Physicists call these causal loop paradoxes, and they affront our desire for the universe to be a rational and ordered system.
What could be more rational, for instance, than finding a good business with good returns on capital and an enduring competitive advantage?
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Part of the recent surge in margin loans may be entirely rational.
One way to control water usage would be a rational pricing policy.
This may not be wholly rational, given that the eurozone has promised 100bn euros of rescue funds earmarked specifically for rescuing Spain's banks.
Reluctance to save for retirement may be quite rational if, as in Britain, prudence is quite likely to mean a loss of means-tested pension benefits.
And this leads to the second false premise of Internet dating: that choosing a mate should be a rational choice, in which people carefully comparison-shop for partners.
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That is, our new economics is terribly useful if we assume that politics and politicians (or even public policy making) can be made rational, perfect and efficient.
Especially since ALCL seems to be a treatable condition, taking this tiny gamble may be a rational decision (for someone who is entertaining to possibility of getting implants).
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