الذهب والفضة يخضعان بلا شكّ لتقلّبات نتيجة اكتشاف مناجم جديدة وأكثر وفرة؛ ولكن مثل هذه الاكتشافات نادرة، وتأثيراتها، على الرغم من قوتها، مُقتصرة على فترات زمنية قصيرة نسبيًّا.

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