I'm living in a zone, that had experienced tough times during the WW2, from deportations, shelling, and hunger to hyperinflation. In 1944 in public places you could see people selling artwork, rare books, or even household objects, because there were no jobs.
Major natural disasters, civil unrests, or devastating wars are reshaping the local society. Depending on the cultural and educational backgrounds of the community members, the spontaneously emerging market-based relationships may degrade into command-and-control based relationships, or continuous warfare between rival groups.
Either way, the market continues to operate, and in zones with electricity and Internet coverage the online market will connect people.
In the 90's the former COMECON countries went through major economic restructurings, and in certain former Soviet states the barter was the king, many factory workers received products instead of payment. In addition to supplying their friends and families with goods received as salaries, people were placing announcements into free advertising brochures - the predecessors of the online marketplaces.
The proliferation of the Internet has brought with him the more and more specialized marketplaces, complementing the web-shops, and local advertising websites.
It's not a new thesis, that the structure of a given population's supply and demand is characteristic to the state of their local economy, but the job market looks to me even more interesting, because it says a lot about how people controlling significant resources are thinking about the future of their industries and/or geographic zones.
As a long term telecommuter I've seen the rise, consolidation and restructuring of various freelancer marketplaces. After 2015 the numerous junior and middle level programmer job offers have been replaced gradually by a reduced number of offers for senior level specialists in development, QA, and cloud infrastructure.
Currently there is high demand for marketing wizards, sellers, and managers expected to run smaller companies or teams. It looks like business people aren't into investing in jobs, they are mostly after cash. Since less jobs does mean less purchasing power, the "everything is for sale" psychosis looks like a signal of upcoming changes in the macroeconomic landscape.
