Pictogramme of hierarchy - people on a ladder. A hierarchy (from the Greek hierarchia, rule of a high priest, from hierarkhes, leader of sacred rites) is an arrangement of items (objects, names, values, categories, etc.) in which the items are represented as being above, below, or at the same level as one another.
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It accepts MasterCard Inc.'s MasterCard and Discover Financial Services Inc's Discover card in its physical stores. Online, Sam's Club already accepts American Express, in addition to Mastercard, Discover, and Visa Inc.'s Visa. Wal-Mart's main stores already accept American Express.am's Club will also accept Amex's Bluebird prepaid debit card, sold in Wal-Mart stores, which was launched in 2012 as an alternative to bank checking accounts that can carry high fees.