All of the following contributed to the collapse of the stock market in 1929 except
investors bought stocks on margin.
the real worth of companies held steady.
businessmen started companies called "investment trusts" that bought stock on credit.
investors poured money into risky investments.

The best and most correct answer among the choices provided by the question is the second choice "the real worth of companies held steady.businessmen started companies called "investment trusts" that bought stock on credit. "

The stock market crash of 1929 was not the sole cause of the Great Depression, but it did act to accelerate the global economic collapse of which it was also a symptom. By 1933, nearly half of America's banks had failed, and unemployment was approaching 15 million people, or 30 percent of the workforce.

I hope my answer has come to your help. God bless and have a nice day ahead!

February 1848 is when it was added. if that's what you were asking