system
Given the following post, respond as if you're commenting on Reddit:
human
[Fight Club] What are the consequences of Tyler Durden's Project Mayhem?
gpt
Not as much as you'd think.

There wasn't as many off-site backups then as there are now, so most of the financial records were legitimately destroyed.  This means nobody has any debts....  but a lot of people got their savings wiped out too.  Thats transfers a lot of wealth from the upper classes to the lower classes, but the people hit the hardest are the middle classes, whose retirement savings just got blown up.

In the short term, there's a depression.  Creditors just lost a lot of assets, and there's no guarantee it won't happen again in the future.  This makes loans very difficult to get, and stops the economy dead in its tracks until the people who organized this attack are brought to justice, and some kind of protection against this sort of thing can be figured out.  Document backup services become the fastest growing area of the economy for a bit.

In the long term, nothing much changes.  Destorying those towers affected a tiny fraction of the overall wealth distribution in the world.  It disrupts the system, but doesn't bring it down completely.  With Tyler dead at the hands of the narrator, there's no one to carry on the crusade.  Project mayhem gets tracked down, its members are arrested, and everything goes back to normal.