سعر كل شيء يرتفع وينخفض من وقت إلى آخر ومن مكان إلى آخر؛ ومع كل تغيير من هذا القبيل، تتغيّر القوة الشرائية للنقود كلّما تغيّر سِعر ذلك الشيء.

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