At the end of your GM’s chosen interval, they review the Resource Notation Table.
Any resource with a bonus of 3 or more in its PC column increases by 1 for each 3 points of bonus, for a maximum increase of 3.
Any resource with a penalty in its Total column decreases by 1 for each 3 points of penalty, for a maximum loss of 2.
Any remaining modifiers are now reduced to 0.
The GM now start a new Resource Notation Table, with resource ratings altered to reflect any changes from the above process.
Having made permanent changes to the community’s resource ratings, your GM then restarts the cycle by again testing for a new set of background events.