A shop system that allows the player to view a log of transactions within their shop.

This would be beneficial to allow the player to have a record account of how items are handled within a specified period of time. For instance, the business owner can track which of their items are being bought and keep a tally of the prices without having to try and remember off-hand. I believe the best way to view this system would be through a cash flow graph that shows the ins and outs of the business (income and expenses--what is being bought vs what is being sold to the shop).

I personally find it difficult to keep track of merchandise that is actually being sold in shop when I actively use the items within my chests (e.g. taking carcasses that is listed in shop from chests and using it to make food). With this system it only records the transactions of other players with the shop as to avoid inaccurate tracking of what is being sold and bought.

TL;DR

A system should be set in place for shops to where the player can see the flow of items being bought and sold in their shop in a transaction with other players, ignoring the movement of items listed in shop within chests that aren't being sold.