Why did stock prices fall in 1929?

The Stock Market Crash of 1929 devastated the economy and was a key factor in beginning the Great Depression in the United States. This period was also known as The Great Wall Street Crash of 1929 and Black Tuesday. Stock prices began falling when steel production went down, house construction slowed and car sales waned and people started to sell off their stock in mass numbers. This lead to Black Tuesday. On that day, there were so many orders to sell that the ticker quickly fell behind. People panicked, as they couldn't get rid of their stocks fast enough. Everyone was selling and nearly no one was buying, therefore stock prices collapsed.