The economy between bro's that always seems to be apparent after spotting someone who is tight on cash, and after beer runs.
HEY BROSKI! our broconomy has a surplus, I owe you 30$, you owe $30 to Kody and Kody owes me $30 therefore we don't owe anyone anything... and between the empties and the change we pulled out of the couch we have a surplus!
The vast, unofficial economy that exists between bros, buddies, acquaintances, and sometimes even complete strangers. It consists of favors, trades, promises, IOU's, and similar exchanges of goods and/or services. Without it, the world as we know it would collapse into madness and disorder.
Mike brought a case of beer for poker night at Joe's house because Joe had driven him home from a party the other night. They had unknowingly just participated in the broconomy.