Will Wilkinson

<p>The bestselling <i>Positivity</i> tells us that there’s a precise tipping point at which being chipper delivers health and success, a conclusion trashed by a new study. Will Wilkinson sorts out the controversy.</p>

In his budget speech, the president called on the nation to share sacrifice, but only the rich are being called upon to bear that burden—his $4 billion deficit reduction depends on touchingly optimistic savings from Obamacare, not cuts to entitlements.