Externalities, clean up costs etc are currently not being charged which makes some products economically viable when they probably shouldn't be.

For example in China Coal plants keep getting opened, because despite a cheaper lifetime cost for solar, coal has a much lower upfront cost and without meaningful costs for environmental damage well you can always sell the fully profitable plant before the late life costs come and bite you. (There is more to it, but thats the simplified version of it).

Same with single use plastics. They are really cheap to make, but what about cleaning them up, recycling them etc. Without counting that cost, yeah manufacturing plastic is extremely cheap compared to like a well made pottery plate. But in 50 years the clay plate is still around and the plastic one is just microplastics in the ocean forever.