DE were the most convenient non-bullion coin, followed by Eagles. Lower denominations were seldom exported. Each U.S. bag contained the same weight of gold, so that did not matter. But smaller denominations were subject to greater abrasive loss in bags (larger surface area), and increased "evaporation" during handling in counting rooms. Half Eagles and other small denominations were less reliably available in large quantities necessary for international trade. The intermittent coinage of Saint-Gaudens Eagles is an indicator of very limited international trade demand. Lastly, 20th century gold coinage was dominated by the need to convert bullion into coin to cover paper currency backing. $20s produced more dollars-per-strike than any other denomination.