Gold and silver are good assets to hold to insure the preservation of EXCESS wealth but there are other assets that are even more valuable longterm. Those things that can be used to produce a product are the elements that can be used to leverage your time, resources and talents to produce wealth. The ability to produce excess is the basis of the need for wealth preservation.
Physical goods in the form of equipment that can be used to create or produce goods needed by society are the basis of prosperity and wealth in the world. Gold and silver only become necessary when society begins to produce more products than the producer can use. This excess production is then traded for those things that can preserve the value of this excess production until it is needed by individuals.
Machines to build or repair such as saws and hammers, sewing machines, metal fabricating machines such as lathes and mills and machines to convert raw materials to value added products such as steel to I beams or pots and pans, wheat to flour or pasta, lumber to finished furniture and cotton to cloth are the assets that define how prosperous you are as a nation. A nation derives its wealth from having a product to sell. That will never change. It is true for nations as well as for individuals.
Individuals need to have the ability to produce something in excess of their needs to advance to the need to store that excess. This requires tools and equipment in most cases. You do not necessarily need to process your own resources to generate this excess. A miller can provide the equipment to grind grain for the community taking part of the production for his time and effort.
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