Not all gift cards are redeemed. The card may be lost, there may be time decay expiration and fees or complex rules of redemption, or the recipient may not be interested in the store that accepts the card or be under the false assumption that not using it will save money for the giver. It has been estimated that perhaps 10% of cards are not redeemed, amounting to a gain for retailers of about $8 billion in the United States in 2006.[1]