The economic damage caused by the September 11th attacks was estimated to be about $30 billion, which included a drop in the wealth of the US economy by about $46 billion.
This had a deflationary effect on the US economy, causing the unemployment rate to fall. This is because when the US economy is hit with a large drop in wealth, businesses tend to cut costs by decreasing the number of employees, leading to a decrease in the unemployment rate.
An economy experiences deflation, also known as negative inflation, when prices generally decline. This may be due to a surplus of commodities relative to the demand for those things, but it may also be due to an increase in the purchasing power of money.
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