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The second derivative of prices hurts people hard when it is strongly positive because real wages lag real prices.
Even when real wages keep up with real prices, people still hate inflation, because they attribute their rising wages to their own successes more than macroeconomic changes. To most people it feels like "I'm working hard and getting big raises for it, only to be stymied by rising prices" rather than "this is all happening due to forces outside my control".