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Even if we find thousands more tons of gold, I am sure it will never lose its value, and the price will still increase over time. The demand for gold is huge and the use of gold is not only for investment but also for use in all industries, daily life...while bitcoin is just an asset for investment and speculation. So comparing supply and claiming bitcoin is superior is not convincing.
We need to admit that gold is still needed for now and maybe for decades to come. Because not only for investment or reserves, gold is needed in many fields, most specifically in electronics and semiconductors. So when we compare gold and bitcoin, it is actually not necessary, because each instrument has its own advantages. and I am sure that wise people can see that both are equally important, whether now or in the future.