Inflation compounds year over year, not just once. A posted 2.5% annual CPI rate means $100 in 2015 buys only $78 worth of goods by 2025, a hidden 22% pay cut to your purchasing power.
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This CPI that you see annually is actually like a compounding effect. So each year it's not like your price is still stagnant at 2.8%, but each year the erosion of your purchasing power is actually going down. And I'm just using their posted rate, but it's not really the same thing. So every $100 in 2015 now, 10 years later, buys about $78 worth of goods. I would roughly put the real is probably close to $70. So that's like a 22% pay cut you actually don't see on paper. If you think of it from the business, you've got a profit, and that profit may show $100, but the real purchasing power from that $100 is actually $78.