Do privately owned stores have to accept coupons?

This store is privately owned and the only Chinese store in town. They sell items that have the manufacture's coupons attached to them but do not accept the coupons. Can they refuse the coupons, even when they sell the item with the coupon? I know some coupons say "only at participating stores" but... show more This store is privately owned and the only Chinese store in town.

They sell items that have the manufacture's coupons attached to them but do not accept the coupons. Can they refuse the coupons, even when they sell the item with the coupon? I know some coupons say "only at participating stores" but some do not have that printed on.
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