A little follow up. Note from Jack Dangermond's keynote at the Esru UC 2016 http://video.esri.com/watch/5149/enabling-a-smarter-world
He had a parcel map behind it. I said, "Well, that's interesting. Where is that parcel map coming from? Is that on your desktop?" He said, "No, no, no, it's coming as a service." It turns out that the parcel map is coming as a service from L.A. County, who does about 150 updates and transactions on parcels every day. He was no longer copying the data, having to update it. He was reading in like dial tone behind his map a basemap of parcel data from the county. The city and the county are working together. They're sharing their data. As services, they're leveraging each other's transactional work in real time.