How did the World Trade Center attacks damage world economies?

The way the World Trade Center attacks damage world economies:

The Political ramifications of the assaults of 11 September were initial disruptions which led to a sharp decline in the global financial markets. The assaults on September 11 ended in insurance claims of about $40 billion, making greatest of them covered happenings in history.

Mainly the 911 Economic impacts. The major economic influence of the 9 November attacks was how higher investment in security contributed to the financial crisis in the United States.

The events on 11 September have culminated in the US war in Afghanistan and increased domestic security expenses. Have blamed for all the war in Iraq have been the bombings. The estimates of the two battles have reached 5 trillion dollars to date.