Resource indicators on the top bar display current amount of corresponding resources as well as the total growth or decline per a certain period of time. One month consists of approximately 5.8 such intervals. Keep in mind that the shown growth/decline is not the exact value but the closest integer value. It means that if you see for example +2 Food your real food income may vary between +8.6 and +14.5 per month.

Unlike other resources Stone and Iron do not have growth indicators.