I'm curious:

Can bank runs be really prevented? 

Assuming fractional reserve banking is to stay, what can stop a bank from causing a flight of withdrawal?

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True. If we are to assume it's the loss of trust that drives a large section of the society to scamper to withdraw, then fractional reserve banking isn't the problem. 

Customers are essentially seeking trust markers here... What could it be?

Also curious. Seems like a human nature problem (in part)