What Osama Bin Laden Cost The US: Over A Trillion Dollars

We spotted this in a new academic paper "TERROR, SECURITY, AND MONEY: BALANCING THE RISKS, BENEFITS, AND COSTS OF HOMELAND SECURITY" by John Mueller and Mark G. Stewart.

"The cumulative increase in expenditures on US domestic homeland security over the decade since 9/11 exceeds one trillion dollars"

Statistics Source: Academic Paper by John Mueller and Mark G. Stewart