The first is a pen for raising fighting chickens. The roosters are in cages; you need to keep them separated or they will (obviously) fight. Not all fighting chickens are raised for cockfights, but in largely-unregulated areas of the US, many are. The fights are illegal and rather unsavory, and tend to attract characters who are rather unsavory themselves. Not the kind of thing you want for neighbors.
The second is a building for raising commercial chickens. In my experience, they smell worse than cattle feedlots but better than hog packing plants.
The third is an oddity: many people seem to store their wealth in the form of junk in their yards. Not sure how that's supposed to work, actually. You'll occasionally hear of someone in a metropolitan area being forced to clean up, or having the city do it for them. This is not the case in the regulation-free rural areas.
"Vacant land sales are rarely observed in the United States,..."
I haven't gone through the economic model described in the paper, but it appears to be a traditional, static, linear thing that has a few issues.
If you want to live somewhere with fewer regulations, there are plenty of opportunities. Just avoid these things:
http://kotv.images.worldnow.com/images/6723723_G.jpg
And probably:
http://www.precisebuildings.com/images/uploads/build/400/dsc...
And keep in mind these may be your neighbors:
http://worldonline.media.clients.ellingtoncms.com/img/croppe...