Bear with me:

We need to understand the distinction between two kinds of labeling.

Voluntary labeling="I own this health-food store, and I'm doing my best to sell you non-GMO products. All such products will carry a seal that says 'Non-GMO'."

Mandatory labeling="Vermont has decided that all food products sold in the state which contain GMOs must be labeled as such—'this product contains GMOs'."

Two very different types of labels. They contain different information.

Also, one type is voluntary, and the other becomes mandatory after passage of a vote, in a legislature or through a ballot measure.

Well, let me put it to you this way. What would happen to Whole Foods' program of voluntary GMO labeling if there were mandatory labeling across America, or in any state where Whole Foods does business?