Gold industry use

Approximately 11 percent of all gold produced is used in industry. Because of its inherent properties, gold is used in the medical, electronics, automotive, defense and aerospace industries. It is also increasingly used as a catalyst in many industrial processes. Gold has many medical applications

In one electronic device, gold and Silver can all be used but silver could get oxidized and cause degradation. 

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Gold industry sale sometimes has pool account. Gold owner can lend the gold to company to get regular "interest".