I may be overly simplistic about this, but the presence of many street vendors is a sure sign of a socialist system in place.
It's what I saw when I went to Russia, in 1997. Their abortive attempt at capitalism had many street vendors milling about. I remember being in Red Square, and someone hawked something to our small group, and a burly man clapped his hand on the shoulder of the vendor and escorted him away to punishments unknown. It's illegal to sell on Red Square -- curious, because in history, Red Square was the town market.