Brilliant! That just made me realize that borrowing creates surplus which in turn creates larger and deeper networks. That works really well for everyone if supply and demand are stable and no one gets very greedy. But if not, then things can go bad for everyone.

For example if Tom's stall does not work well, then the "cookie crumbles". Your mom, of course, being your mom will still give you cookies, no matter you did not make wise decisions earlier and you will still hold on to your incumbent position as a cookie distributor even though you don't deserve it anymore.

This goes on for a while, till people don't want your mom's cookies anymore because, all their moms have also started distributing cookies generously.

Then a new kid comes to your neighbourhood with an exciting new flavor of cookies and suddenly it seems cool to be having those cookies. Your mom, obviously does not like it and tries to out-law or regulate those cookies. But then, the train has already left the station.