GDC 2012: Breaking down SimCity's Glassbox engine

https://gamedeveloper.com/design/gdc-2012-breaking-down-em-simcity-em-s-glassbox-engine

Reports Andrew Willmott's GDC 2012 talk: units hold resource bins with capacities (a house with 20/30 food, 4/10 people); rules move or combine resources; agents carry resources, including units of water in pipes; maps hold depletable resources.

Production chains, SimCity (2013), Storage and buffers