From the top of my head making all wires out of gold you would get much better conductivity & avoid the issues copper has with oxidation. I'm sure there are exa

From the top of my head making all wires out of gold you would get much better conductivity & avoid the issues copper has with oxidation. I'm sure there are examples for other currently expensive materials. Also aluminum used to be super expensive and only used for jewelry until it became dirt cheap and is used for about anything.