"...considerably harder to even find such guns." Why does the author suggest that guns would be any harder to find? The gun shops wouldn't close up shop and su

"...considerably harder to even find such guns." Why does the author suggest that guns would be any harder to find? The gun shops wouldn't close up shop and suddenly go into hiding. They'll just take cash. If the author wants to suggest that banks stop doing business with gun dealers, forcing them to protect their own cash, the market will respond - potentially with new financial institutions willing to do business with them.