Default Money Resource?

[MonsterMan]

I found this setting on the General tab. What does it do? I used the help function and from the description, I gathered that when a unit steps over a goody hut, the specified resource appears in place of the goody hut. So I copied part of the Easter Island Heads and made a "Ruins" resource (w/o any bonuses), but nothing happens when I step on goody huts. I tried with several other resources as well, thinking it might be a problem with the thing I created, but it didn't change.

[Willem]

Everytime you go into a goody hut and receive money, the resource you selected will appear on the map.