You really have to love such a poorly educated person that they claim inflation is due to corporate greed. Yes corporations do need to make money. Yes they try everything the can to squeeze that extra penny out. But inflation is not because of them. If it were there would be companies selling say a candy bar for 5 cents because they would be getting every last person to buy it instead Of the fifty cent my other manufacturers.
It's like anything else: supply and demand, the oldest rule of price increases or decreases.
Almost immediately after Dementia invaded the White House, he signed a pork bill that Trump refused to sign. It basically said that the federal government was going to pay people more to stay home than work. The policy stretched all the way to September of last year, but the lingering effects were still taking place. In our state, between state and fed unemployment, they estimated it was equal to a working person making nearly 60K a year when you figure in taxes that non-working don't have to pay. If you live at home in moms basement, the extra money you made can last months if not over a year.
But some did start going back to work, and unemployment slowly lowered. As for big evil business, they had to increase pay offers to compete against government. As you stated already, all costs get passed down to the consumer. Bingo! Inflation. With increasing fuel costs and lack of drivers, transportation costs increased on those products as well. Trust me as a retired truck driver, my cab only got 6 miles to the gallon with city and highway driving. Now you have to figure in the additional utility costs for businesses to operate.
I read other theories here, and one might ask what evidence I have for my theory. The answer is simple, look at the costs and prices around the country. Big lib cities and states have a higher cost of living than American states. For instance a house you pay 800K for in a commie state, you can buy in my state for less than half the price. A person in my state can buy a home making around 40K a year. If you make 40K a year in New York or California, you're lucky to be able to afford a very small one bedroom apartment. Anybody that thinks I'm full of it, just watch HGTV for a couple of weeks, particularly the show My Lottery Dream Home.
But this didn't happen in select states, in this case the same exact thing happened nationwide thus inflation at it's highest point in 40 years. Labor demand and pay to attract them will not stop either until the near empty warehouses are once again replenished.