Farm stand vs. farmers market

What's the difference between a farm stand and a farmers market? It's like the difference between a thread and a shirt. It's like the difference between a room and a home. You can't really have a farmers' market without a collection of individual farm stands. Still, the stands at farmers markets are not the same as the permanent stands in fixed locations at the farm or the end of the driveway. Or... Am I wrong? Are farmers markets really, truly more than a collection of individual farm stands? Maybe the market itself takes on a persona? Click for more or add to the conversation...