Porting a shop plugin (Ultimarket) (1.10.2)



I am looking for a plugin here similar to, or a port, of this shop plugin.

Basically what this plugin does is have shops with items that change based on supply and demand. It boils down to this:

  • Buying an item increases its price
  • Selling an item decreases its price

It would be much appreciated if one could do this, thanks!