Overseas - mainly European - selling was an important factor. Some conspiracy theorists, such as Webster Tarpley in his "British Financial Warfare", supported by contemporary reporting by the likes of "The Economist", went as far as writing: "When this Wall Street Bubble had reached gargantuan proportions in the autumn of 1929, (Lord) Montagu Norman (governor of the Bank of England 1920-1944) sharply (upped) the British bank rate, repatriating British hot money, and pulling the rug out from under the Wall Street speculators, thus deliberately and consciously imploding the US markets. This caused a violent depression in the United States and some other countries, with the collapse of financial markets and the contraction of production and employment. In 1929, Norman engineered a collapse by puncturing the bubble".
The crash was, in large part, a reaction to a sharp reversal, starting in 1928, of the reflationary, "cheap money", policies of the Fed intended, as Adolph Miller of the Fed's Board of Governors told a Senate committee, "to bring down money rates, the call rate among them, because of the international importance the call rate had come to acquire. The purpose was to start an outflow of gold - to reverse the previous inflow of gold into this country (back to Britain)." But the Fed had already lost control of the speculative rush.
The crash of 1929 was not without its Enrons and World.com's. Clarence Hatry and his associates admitted to forging the accounts of their investment group to show a fake net worth of $24 million British pounds - rather than the true picture of 19 billion in liabilities. This led to forced liquidation of Wall Street positions by harried British financiers.
The collapse of Middle West Utilities, run by the energy tycoon, Samuel Insull, exposed a web of offshore holding companies whose only purpose was to hide losses and disguise leverage. The former president of NYSE, Richard Whitney was arrested for larceny.
Analysts and commentators thought of the stock exchange as decoupled from the real economy. Only one tenth of the population was invested - compared to 40 percent today. "The World" wrote, with more than a bit of Schadenfreude: "The country has not suffered a catastrophe ... The American people ... has been gambling largely with the surplus of its astonishing prosperity." "The Daily News" concurred: "The sagging of the stocks has not destroyed a single factory, wiped out a single farm or city lot or real estate development, decreased the productive powers of a single workman or machine in the United States." In Louisville, the "Herald Post" commented sagely: "While Wall Street was getting rid of its weak holder to their own most drastic punishment, grain was stronger. That will go to the credit side of the national prosperity and help replace that buying power which some fear has been gravely impaired".
During the Coolidge presidency, according to the Encyclopedia Britannica, "stock dividends rose by 108 percent, corporate profits by 76 percent, and wages by 33 percent. In 1929, 4,455,100 passenger cars were sold by American factories, one for every 27 members of the population, a record that was not broken until 1950.
Productivity was the key to America's economic growth.
Because of improvements in technology, overall labour costs declined by nearly 10 percent, even though the wages of individual workers rose".
Jude Waninski adds in his tome "The Way the World Works" that "between 1921 and 1929, GNP grew to $103.1 billion from $69.6 billion. And because prices were falling, real output increased even faster." Tax rates were sharply reduced.
John Kenneth Galbraith noted these data in his seminal "The Great Crash": "Between 1925 and 1929, the number of manufacturing establishments increased from 183,900 to 206,700; the value of their output rose from $60.8 billions to $68 billions. The Federal Reserve index of industrial production which had averaged only 67 in 1921 ... had risen to 110 by July 1928, and it reached 126 in June 1929 ... (but the American people) were also displaying an inordinate desire to get rich quickly with a minimum of physical effort".