As continental banks tumbled, British banks held back their capital, unsure of which institutions were most involved in the mortgage crisis. The cost to borrow money from another bank — the interbank lending rate — reached impossibly high rates. This banking crisis hit the United States in the fall of 1873. Railroad companies tumbled first. They had crafted complex financial instruments that promised a fixed return, though few understood the underlying object that was guaranteed to investors in case of default. (Answer: nothing). The bonds had sold well at first, but they had tumbled after 1871 as investors began to doubt their value, prices weakened, and many railroads took on short-term bank loans to continue laying track. Then, as short-term lending rates skyrocketed across the Atlantic in 1873, the railroads were in trouble. When the railroad financier Jay Cooke proved unable to pay off his debts, the stock market crashed in September, closing hundreds of banks over the next three years. The panic continued for more than four years in the United States and for nearly six years in Europe.

The long-term effects of the Panic of 1873 were perverse. For the largest manufacturing companies in the United States — those with guaranteed contracts and the ability to make rebate deals with the railroads — the Panic years were golden. Andrew Carnegie, Cyrus McCormick, and John D. Rockefeller had enough capital reserves to finance their own continuing growth. For smaller industrial firms that relied on seasonal demand and outside capital, the situation was dire. As capital reserves dried up, so did their industries. Carnegie and Rockefeller bought out their competitors at fire-sale prices. The Gilded Age in the United States, as far as industrial concentration was concerned, had begun.

The echoes of the past in the current problems with residential mortgages trouble me. Loans after about 2001 were issued to first-time homebuyers who signed up for adjustablerate mortgages they could likely never pay off, even in the best of times. Real-estate speculators, hoping to flip properties, overextended themselves, assuming that home prices would keep climbing. Those debts were wrapped in complex securities that mortgage companies and other entrepreneurial banks then sold to other banks; concerned about the stability of those securities, banks then bought a kind of insurance policy called a credit-derivative swap, which risk managers imagined would protect their investments. More than two million foreclosure filings — default notices, auction-sale notices, and bank repossessions — were reported in 2007. By then trillions of dollars were already invested in this credit-derivative market. Were those new financial instruments resilient enough to cover all the risk? (Answer: no.) As in 1873, a complex financial pyramid rested on a pinhead. Banks are hoarding cash. Banks that hoard cash do not make short-term loans. Businesses large and small now face a potential dearth of short-term credit to buy raw materials, ship their products, and keep goods on shelves.

If there are lessons from 1873, they are different from those of 1929. Most important, when banks fall on Wall Street, they stop all the traffic on Main Street — for a very long time. The protracted reconstruction of banks in the United States and Europe created widespread unemployment. Unions (previously illegal in much of the world) flourished but were then destroyed by corporate institutions that learned to operate on the edge of the law. In Europe, politicians found their scapegoats in Jews, on the fringes of the economy.