Well, good riddance!
Next step: manufacturing building are no longer capable of produce an infinite amount of the manufactured (local) resource on demand. You can no longer support 5 barracks with a single lvl 1 butcher, as it can only support a maximum of 40 resource conversions per turn (this means 40 pork from 20 pigs, enough to feed 2.86 soldiers). In order to increase capacity, you must either level up your buildings or build more of them in town.