The Dark ages of Greece is considered to be the time period after the Mycenaean civilization had declined, which was around 1200 BC, and before the Archaic period of Greece, which was around 800 BC.
During those times it seems that a period of impoverishment ensued and very little is actually known. With that, we don't even know which were the ruling dynasties and kings in those times.
The negative consequences could be that there would be more homeless people on the street (and not because we couldn't get jobs), There could also be rioting in the streets.
