> in the long term there is going to be a lot of possibly 'dead' coins which makes reasoning about the market difficult. Why is it difficult? No one "invalid

> in the long term there is going to be a lot of possibly 'dead' coins which makes reasoning about the market difficult. Why is it difficult? No one "invalidates" US paper currency that hasn't traded for 10 years. A certain amount of US currency has been burned up in fires or lost to washing machines, yet no one seems concerned. Instead, they use surveys and other forms of statistical analysis to determine the amount in circulation, rather than relying on the US Mint's records of what was ever printed. The same would work for Bitcoin.