“FOR HISTORIANS each individual occasion is unique,” wrote Charles Kindleberger in his examine of money crises. But whilst “history is specific economics is general”—it consists of exploring for patterns which point out if a cycle is turning. Nowadays America’s financial program appears almost nothing like it did in advance of the crashes of 2001 and 2008, but recently there have been some acquainted symptoms of froth and anxiety on Wall Road: wild trading times on no actual information, sudden price tag swings and a queasy emotion among many buyers that they have overdosed on techno-optimism. Owning