If economy fails the worst suffer would be citizens, there would be war situation within that economy.
An economy based on only one market is an invitation to disaster. If that market fails, the entire economy fails. With diversification, an economy can survive a failed market.
When MBR fails then the operating system will not load.
See http://www.fivecentnickel.com/2008/09/22/what-happens-to-your-mortgage-if-your-bank-fails/
you would die
Try it
You will have to go to a doctor.
If your digestive system fails you will suffer and possibly die from malnutrition.
When interpositional reconstruction fails, total joint replacement may be necessary
That's a miscarriage.
You die.
What happens depends greatly on which module fails. If the engine control module (computer) fails it may cause the engine to run poorly or not at all. If the ignition module fails the engine won't start.
you die a slow and painful death!!