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Definition: Y term a ddefnyddir am egwyddor Paragraph 2(a) o Atodiad y GATS ar Wasanaethau Ariannol. Mae'r paragraff hwn yn caniatáu i aelodau Sefydliad Masnach y Byd fabwysiadu pa bynnag fesurau y maent o'r farn sy'n briodol am resymau darbodus, wrth reoleiddio masnach mewn gwasanaethau ariannol.