Something I find a pain in economy while being a shop owner is keeping track of what is bought and sold. Its nice to have it show in chat when someone buys it at that second. However, after 5 seconds that log is gone, and I don't know what has been bought and what has been sold. If there were any kind of device, or command or something that has the ability to see a log of what was sold and or bought would be very helpful. This could better track my sales, and finance new things for my shop.
Support, though my understanding is the chest shop plugin wasn't created by this dev team so any solution to implement this could be difficult - especially considering that a log file would have to exist for 200k unique users and maintained server side.