On October 24, 1929, a record 12.9 million shares of the stock were traded on a day that became better known as "."

The black thursday of the Wall Street Crash of 1929.

Explanation:

As the exercise presents, on October 24 of 1929, a record of 12.9 million shares of the stock were traded on a day that became better known as the black thursday. On that day's opening only, the market lost 11 percent of its value at the opening bell. This was the start of what we now know as the Wall Street Crash of 1929.  

the factors that the economies of the muslim empires prosper were:

1- land trade routes-located between three continents  

2- sea trade routes

trade contributed to the spread of muslim empires, and with that islamic culture led to a growing feeling of internationalism resulted in the transfer of technology, science, and other cultural forms.