Teenagers ultimately don't mind belonging to a group, because there's always the opportunity to eventually become someone new. The elderly, by definition, are running out of opportunities for reinvention.

Everyone dies, and before that, most people eventually lose some of their faculties. So some people worry that as marketers get better at targeting the elderly, the line between advertising and unscrupulous manipulation will be harder to discern.

Calling out people for not voting, what experts term 'public shaming,' can prod someone to cast a ballot.

The cooperation of NASCAR - or any other system, it turns out - persists only when everyone believes he has the opportunity to win.

In general, insurers say criticisms of claims-handling are unfair because most policyholders are paid promptly, and some denials are necessary to root out fraud.

Entrepreneurs do not try and create new types of smartphone technologies now because they know it's pointless: They're going to get sued almost immediately.