Silvio Berlusconi, Italy's prime minister, leads a four-party ruling coalition that barely coalesces and scarcely rules.

ECONOMIST: Ersatz Europeans

In most primaries the party quickly coalesces around a winner.

ECONOMIST: Lexington

As the group coalesces around one perceived knowledge holder, minorities are less likely to share their own perspectives, despite the fact that minority opinions make groups wiser as a whole.

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We form coteries as we stretch before class or in the humid euphoria of the dressing room afterward, chatting and complaining and comparing notes about teachers, and somehow this coalesces into intimacy.

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It may mean subscribing to the publications that your target audience reads, following the influential members of that audience on twitter, attending the conferences and meetups, noting the issues that interest them and around which that community coalesces.

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