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Events on Friday 9 May 1873 1
1873Vienna Stock Exchange crash"Black Friday" collapse in Austria-HungarySpeculative overbuilding fueled by the 1873 Vienna World's Fair drove a stock market boom that collapsed on 9 May 1873, wiping out investors across the Habsburg capital. The Gru00fcnderkrach, as it became known, spread financial panic into Germany and helped trigger the wider Panic of 1873.