In this rate, regular 1917 LP08 by inflation rate should be $56 x 7.65 = $428.40, putting population increased 100% since then (so number of collectors also increased 100%), $428.40 x 2 = $856.80. The gap between this number and current market is big, what's not been put into the formula yet?
I bet there are still $856.80 LP08s today, but it has to be a pure shooter. Retro back, was that $56 LP08 in the list sold as a pure shooter??
If not, say, if that LP08 is a nice collector item, the only way to interpret this price gap being wealth indeed increased over these years. At absolutely lower income, people don't have much money left after covering living cost. Whatever left decided non-daily-essential items price, including LP08. Since real income increased since 1964, the price of collectible item could increase higher than inflation, not bound to inflation rate, due to its supply is pretty much fixed.
Is this sustainable in next 30 years? Probably these will be more related with inflation rate. That's my feeling, due to the price is not low anymore. But if real wealth indeed increases again in next generation, C&R could increase higher than inflation rate again. So, depends.
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