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silver has low resistanceAnswerIn reality, low resistance / high conductivity is a desirable attribute of any wire / interconnect device, thus silver, based on this attribute, would be a good wiring medium.

A more accurate answer is that silver is heavier than copper, softer, and has very similar conductivity. Silver is 10490 kg/m^3 while copper is only 8930 kg/m^3. Their bulk resistance is something on the order of 1.6 microOhm/cm for silver and 1.7 microOhm for copper.

Long story short, why would someone spend more money on a metal that doesn't hold up as well, is heavier and has slightly better conductive properties that most likely will never be used.

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