So I've been thinking about inflation lately, and there's actually a pretty interesting distinction between two main types that most people don't really talk about. One of them is demand pull inflation, which basically describes what happens when people have money to spend but there's just not enough stuff to buy.

Think back to 2020-2021. When the pandemic started shutting everything down, factories went offline and supply chains got absolutely wrecked. Then vaccines rolled out, people felt safer, and suddenly everyone wanted to go out and spend money again. But here's the thing - factories hadn't caught up yet. You had all these consumers with cash in hand trying to buy everything from lumber to copper to airline tickets, but the supply was nowhere close to keeping up. That's demand pull inflation in action. Too many dollars chasing too few goods, as economists like to say.

The housing market was a perfect example. Low interest rates meant people could finally afford mortgages, so demand for homes exploded. But you can't just build houses overnight. Prices skyrocketed because demand was pulling prices up while supply stayed constrained. Same story with energy - gas prices climbed as more people got back to work and started driving again.

But there's another inflation type that works completely differently. Cost-push inflation happens when production costs go up - think oil prices spiking due to geopolitical issues or natural disasters hitting refineries. When your inputs get more expensive, you have to pass that on to consumers even if demand hasn't changed. A hurricane shuts down a refinery, crude oil supply drops, and suddenly gas costs more at the pump. That's cost-push, not demand pull inflation.

The pandemic recovery really highlighted demand pull inflation because you had this perfect storm of stimulus money, low rates, and pent-up consumer demand hitting a supply-constrained market all at once. Employment bounced back, people had disposable income, and they wanted to spend it. Prices just kept climbing.

Central banks like the Fed actually aim for around 2% inflation annually because a little bit of controlled inflation is seen as healthy for economic growth. But when you get demand pull inflation running hot like we saw post-2020, that's when things get tricky for policymakers.