Consumer price indexes change. The price of almost everything changes, even in the same time period the price of different goods and services vary depending on

Consumer price indexes change. The price of almost everything changes, even in the same time period the price of different goods and services vary depending on where you are and how much of it you are buying at once. Nice history of the price of light: https://www.vox.com/2015/6/9/8749751/historic-cost-of-lighting https://www.vox.com/2015/6/9/8749751/historic-cost-of-lighti... The price of transistors has famously dropped by half every 2 years. The price of t shirts fell even when the price of cotton stayed the same: https://www.forbes.com/sites/samanthasharf/2013/07/02/the-t-shirt-turns-100/#136442865305 https://www.forbes.com/sites/samanthasharf/2013/07/02/the-t-... Brazil has such great variation in CPI that they need to calculate it for all their major cities. Even if we purposefully chose something had it's supply held almost perfectly constant we see heavy price drift. (land is a great example, most countries don't see significant land gain or loss)