The number of people affected by the bombing is very much higher than we have allowed for here--keep in mind that the average number of deaths per week in natural disasters is about 1,300--which means that the death toll on this one say is the equivalent of all the deaths from natural disasters for at least 5 weeks--

If we compare numbers, we discover that the ratio is that for every 1,300 people killed by a natural disaster, there are about 4 million directly affected--which lets us extrapolate that at least 20 million people are directly effected by the WTC bombing--In fact, I would say that the numbers are much larger even than that, since many of the missing and dead provided essential financial services for people all over the world--

The world-wide financial losses from this one incident dwarf the total that $280 billion yearly total that you mentioned--the stock market losses alone exceed a trillion dollars--Add the lost wages, lost revnues, destruction of property, insurance compensation, et al, and this could be the single most costly disaster in history--