Contributions are activities a panerugan participates in to serve the economy and to receive goods to use or to trade for other goods.
Trading system:
Any service or product which is created or collected / picked by contributors can be used or gifted or traded for something else.
If someone gets rewarded for their service or delievery for the greater good, they will be rewarded with food hunted by the Gold-Silver-Patrol.
Special food places like the Sunflower Café for example. They serve all visiting panerugans and receive good rewards in form of food. They use a part of this food to fulfil their contribution but of course they eat a part of it as well.