Forget about feeling “like a room without a roof,” or whatever that “happy” song says. If you want to know “what happiness is to you,” try living in a social democracy. A recent study confirms something leftists have suspected for a long time: People are happier in countries with larger governments, a more generous “welfare state” and more government intervention in the economy. Policies that depend on the so-called “free market,” on the other hand, decrease personal satisfaction.