Articles like these make me appreciate my business degree, because this list is the basics of any business. 30% COGS, high shipping costs, outsourced manufacturing, big box focusing on low end market, etc is all very normal for almost any industry.
I don't mean to be rude, but you don't need a business degree to understand the very basic things that you mentioned. I am fairly sure that most people using Hacker News understand those simple concepts in business.
More generally, sure, you never “need” an X degree to understand X, but most people won’t have spent the time learning X on their own unless they have an X degree.