it means that while you are playing together, you both share the same responsibilities when it comes to gold. you each have your own gold, but when either person spends any or earns any, it either is taken from both players or shared between both players. ex. buying a 10,000 gold weapon will take 5,000 gold from each of you. ex. earning 3,600 in a job will give 1,800 to the player actually doing the job and 1,800 to the person running around elsewhere.