The American credit cycle is at a dangerous point

The celebrated tome “Capital in the Twenty-First Century”, by Thomas Piketty, a French economist, runs to 204,000 words—longer even than Homer’s “Odyssey”. But the book’s central argument can be distilled to a single, three-character expression: r > g. As long as “r”, the real rate of return to capital, exceeds “g”, the real rate of economic growth—as Mr Piketty calculated it did over the course of the 20th century—then inequality will supposedly widen.