If you get into a dispute and you cannot find a way out, you can ask the other player to roll a dice. Highest roll will win.
To do that, use the “Interact” Menu in the HUD. If the other player agrees, the result will show up in local chat. Dice is not mandatory, but if you both agree to it, please play along with whatever output will be.
To use Dice, please get free upgrade to version 0.81 from the Upgrade Vendor at the entrance of the SIM.