While experts focus on trying to explain the stock market's jumps and dives, we spend a little time cutting through the bull to get some different answers.
Among the factors blamed for China's drop: poor economic data and a looming rules change for large investors. Markets in Europe and the U.S. also were down.
The Dow Jones benchmark started Monday's session above 16,459 and fell more than 1,000 points before closing at 15,871. The index lost about 3.6 percent of its value.
The diverse stock market could be a way to road-test Iran's economy. But experts warn of unique pitfalls: the key role the Revolutionary Guard plays in the economy and the lack of transparency.
The government tried to curb the panic by suspending some trade and also helping to buy stocks. The efforts, however, fell short. The Shanghai Composite fell by 5.9 percent Wednesday.