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"When we look at the experimental data, weak ties are better, on average, for job mobility than strong ties."

"If that psychological barrier is not overcome, then this will be a downhill process."

"When we look at experimental data, weak ties are better on average for job mobility than strong ties."

History also shows that technological revolutions "undermine incumbents," says Andrew McAfee.

"Assuming biofuels are carbon neutral may worsen irreversible impacts of climate change before benefits accrue."

"If you launch a cyberattack, if you do a little bit of homework … no one knows where it came from."

What if, instead of certifying each farmer, palm oil buyers could contract with an entire village and let the community do the enforcement?

Ivan Werning suggests considering a set of different sectors, each hit by shocks in its own way.

"Opportunity to invest climate-consciously does not erode individual political support for climate regulation."

"There are plenty of good models around to help both developing and industrialized countries build better democratic institutions."