What Makes An Art Movement Official?

When the agents and the galleries that promote artist decide to label certain artist with similar styles as a "Movement".  In Dallas we are seeing a lot of incaustic art usually on very large works.  Incaustics are expensive and an artist can have several thousand dollars tied up in his bigger works.  These things are selling for $10,000. To $20,000. And everybody wants one.  They are selling and it is a movement locally.  We will see if it spreads across the country.