Remember when everyone was convinced inflation would just blow over? That's probably the most expensive wrong call the Fed made in recent memory.

Back in 2021, the narrative was everywhere. Jerome Powell, Treasury officials, mainstream economists—they all had the same story: prices are spiking, but it's temporary. Supply chains are jammed up. The economy's reopening in a weird way. Stimulus checks are floating around. None of this is permanent, they said. Just wait it out.

The term transitory inflation was supposed to describe short-term price bumps that would naturally fade away. The Fed had even changed its policy framework in late 2020 to tolerate inflation running above their 2% target. Made sense on paper. Then reality showed up.

Spring 2021 hit and the CPI started climbing. April saw a 4.2% annualized jump—the highest in nearly 13 years. By June it was 5.3%. Powell kept saying don't worry, it's just used cars and supply chain weirdness. Yellen thought it'd drop by year-end. Conventional wisdom said they were right.

They weren't.

By December 2021, CPI was over 7%. Six months later, it exploded to around 9%—a 40-year high. And it wasn't just one sector. Food, energy, rent—everything got expensive simultaneously. Wages started jumping too, which meant more money chasing the same goods, pushing prices even higher.

What's brutal is that workers didn't actually feel wealthier. Real wages dropped 3% year-over-year even as nominal pay went up. That's the inflation trap right there.

Powel eventually admitted the miscall. By late 2021 he was preparing markets for rate hikes. The Fed ended up raising the fed funds rate four times through 2022, going from zero to 2.25%-2.5%. They also started quantitative tightening, basically flooding the bond market to push yields higher. The whole playbook shifted from loose to hawkish in a matter of months.

Looking back, the inflation wasn't transitory at all. It was broad-based, sticky, and way more entrenched than anyone wanted to admit. Supply chain issues, geopolitical shocks (Russia-Ukraine pushed energy prices crazy), massive government stimulus, and an economy that never really wanted to cool down—that's what you got.

The lesson? Sometimes what looks temporary is actually structural. And sometimes the consensus is confidently wrong. The transitory inflation narrative of 2021 is basically a masterclass in how hard it is to call inflection points in real time, even with all the data in the world.