"Farmers Market"

       The look of those two words has changed since my childhood.  What was "Farmers' Market" has become "Farmers Market."  Rare to see an apostrophe in such an instance now.

       The gradual change from the possessive with an apostrophe to NO apostrophe, is a change from answering the question, in effect, "Whose market is this?" to answering the question, "What kind of market is this?"   Noun used as adjective, sometimes called an attributive noun, telling what particular attributes these markets have.  "Farmers sell their produce here.  It's that kind of market."

        Nothing to get too excited about either way, I think.  Maybe we've just gotten lazy and naturally drop things like apostrophes.  Maybe we resent people who own things--"Why isn't it my market too? I shop there."  Don't see how either side wins a decisive victory here.