So, in the absence of reality, you're just going to rest on an appeal to authority. Unless you've owned, operated and run the books on a store, I don't think it's reasonable for you (or I) to just blithely say there's plenty of room in a retailer's budget to increase its own labor costs. We're just supposed to believe you that there's plenty of margin after you include other business expenses? And there's plenty of pricing power for any given good? Most of retail is fairly high-risk and low-margin, especially when you don't look at the specialty retail establishments.
More importantly, this isn't just about what a business could do. The idea is about the principle that the government shouldn't dictate price floors because it feels like it. It doesn't work for sugar and it doesn't for labor. If a business wants to invest in higher-quality employees, they are welcome to pull a Costco and do so. I encourage that; I'm glad Costco can make the numbers work. But that's very different than forcing it.