That was an interesting article, and thanks for posting it. I live in the US, and there's basically no bargaining/haggling about prices except for things like cars or if you're dealing with an individual as opposed to a business.
I don't quite understand currency trading, so I can't give you a good answer to your question, but I related to this statement from what you wrote in the OP:
Sudan has really been hit with bad, uncontrollable inflation that spirals up by two digit percentages every year. I should mention that the government thinks printing more money is going to solve the sky-high (at least for local residsnts) bread and gas prices.
You mentioned pizza, and my local pizza joint just raised their prices fairly significantly, so I think the effects of rampant money printing and/or COVID-19 are starting to show themselves. And if you look at prices of things like stocks, bitcoin, precious metals, they're all sky high. Everything is starting to get inflated, and I don't see any end in sight to this.