By DEIRDRE N. MCCLOSKEY
The Great Enrichment of the past two centuries has one primary source: the liberation of ordinary people to pursue their dreams of economic betterment.
Why are we so rich? An American earns, on average, $130 a day, which puts the U.S. in the highest rank of the league table. China sits at $20 a day (in real, purchasing-power adjusted income) and India at $10, even after their emergence in recent decades from a crippling socialism of $1 a day. After a few more generations of economic betterment, tested in trade, they will be rich, too.