From The Gift:

The poet Gary Snyder, asked in an interview why the oral tradition is so weak in the United States, answered: "Because of the stress on individual names and the emphasis on keeping a text pure."

Each of these preoccupations -- the one a concern of the market, the other a concern of the academy -- treats our art as proprietary works, not gifts.

Spot on. Page 247, in a footnote, in the edition I bought a couple of weeks go.

http://www.lewishyde.com/publications/the-gift