Wikipedia Quote: " The most famous crash, the Wall Street Crash of 1929, happened on October 29, 1929. The economy had been growing robustly for most of the so-called Roaring Twenties. It was a technological golden age as innovations such as radio, automobiles, aviation, telephone and the power grid were deployed and adopted. Companies who had pioneered these advances like Radio Corporation of America (RCA), and General Motors saw their stocks soar. Financial corporations also did well as Wall Street bankers floated mutual fund companies (then known as investment trusts) like the Goldman Sachs Trading Corporation. Investors were infatuated with the returns available in the stock market especially with the use of leverage through margin debt. On August 24, 1921, the Dow Jones Industrial Average stood at a value of 63.9. By September 3, 1929, it had risen more than sixfold, touching 381.2. It would not regain this level for another twenty five years. By the summer of 1929, it was clear that the economy was contracting and the stock market went through a series of unsettling price declines. These declines fed investor anxiety and events soon came to a head. October 24 (known as Black Thursday) was the first in a number of increasingly shocking market drops. This was followed swiftly by Black Monday on October 28 and Black Tuesday on October 29.
On Black Tuesday, the Dow Jones Industrial Average fell 38 points to 260, a drop of 12.8%. The deluge of selling overwhelmed the ticker tape system that normally gave investors the current prices of their shares. Telephone lines and telegraphs were clogged and were unable to cope. This information vacuum only led to more fear and panic. The technology of the New Era, much celebrated by investors previously, now served to deepen their suffering.
Black Tuesday was a day of chaos. Forced to liquidate their stocks because of margin calls, overextended investors flooded the exchange with sell orders. The glamour stocks of the age saw their values plummet. Across the two days, the Dow Jones Industrial Average fell 23%.
By the end of the week of November 11, the index stood at 228, a cumulative drop of 40 percent from the September high. The markets rallied in succeeding months but it would be a false recovery that led unsuspecting investors into the worst economic crisis of modern times.
Although it is popularly believed that the Crash inflicted heavy financial loss on investors during this period, the Great Depression which followed was far more terrible. While the Crash dealt a severe blow to many a stockholder's portfolio, the Great Depression brought obliteration and bankruptcy. The Dow Jones Industrial Average would lose 89% of its value before finally bottoming out in July 1932. "
I see no mention of the LHC causing this stockmarket crash.