Everybody distrusts the government, they rely on each other, learn to do things themselves so they don't rely on others. So, money doesn't exchange hands, taxes don't get paid, GDP doesn't grow, more money doesn't get printed.
This is all in a very interconnected world with a mostly free economy, so outsiders just come and buy up everything because at the end of the day, money matters.
Instead of preparing for collapse, how about preparing for being united in work and life and start trusting and depending on each other more.