A coffee from a coffee shop definitely should be $4 if you want them to ethically source good coffee and have a sustainable business model
I beg to differ. The ethical sourcing is far from most of that cost and very few of those places treat their employees ethically by for example paying them a living wage.
You’re probably going to say something about companies having razor thin profit margins, but in case of every company big enough to have public numbers, the official numbers are AFTER artificially deflating their profits for tax avoidance reasons.
With smaller ones, there’s simply no way to know for sure unless you’re the actual proprietor, but it’s HIGHLY unlikely that $4 is the cheapest they can possibly sell ethically sourced coffee for.