right after 9/11 there was talk of the government setting up a terrorism futures exchange.
just like gold/oil/orange juice, which have been pretty accurate at spotting global trends regarding supply / demand and weather etc,… the terrorism exchange was meant to predict the next location and or date of an attack.
eg, after 9/11 london contracts would have gone up so most likely would be in london etc ( although that wasnt the case :P)

i think they also wanted to try and catch anyone that might have insider knowledge. apparently the week before 9/11 there was a very big increase in sellers of airlines, which some attribute to an alleged al qaeda account.

needless to say the public didnt think a terrosism exchange was in good taste