We visited the Berkeley Bowl market in Berkeley, California and found the proper model. It is based on a voluntary approach that preserves consumer freedom of choice.
 The Berkeley Bowl market has retained free plastic and paper bags.It is also promoting reusable bags with a monetary incentive. This is the smart approach.
 Americans cherish freedom of choice. This lady at the Berkeley Bowl market checkout declined to purchase a reusable bag.

Best of both worlds. This lady brought a reusable bag to the Berkeley Bowl market, but still wants a free plastic bag.
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