Since economic power is so often linked to military power, I decided to calculate just how much military equipment one can buy with a trillion USD. So I found a nice table which lists the total number of all crew-operated military vehicles in US and for each type of vehicle I found the latest model and used its production cost to generously approximate average cost of a vehicle in that category. I then summed up the numbers, and here is what I came up with for all the weapons of the United States:
|# units||unit cost, mln $||total cost, mln $|
|Fighter Aircraft ||3200||43||137600|
I excluded traditional nuclear weapons here, because their cost is almost impossible to estimate correctly. Production cost is minimal and it is mostly the cost of installations, missiles and maintenance.
The conclusion is that a trillion dollar would basically buy the entire weaponry of the United States twice over.
Note also that the ballpark cost of the current financial crisis is already being estimated to be roughly 1 trillion dollars. Just to show how serious the crisis is - and it has only just started.