I’ve spent the last decade working with two types of businesses: service-based (like agencies) and product-based (like e-commerce). When you break things down to first principles, they both make money the same way: Selling inventory. Now, I know what you’re thinking. “I run a service business. We don’t have inventory!” But hear me out… In e-commerce, it’s obvious. You have products on shelves (or in warehouses), and you sell those to generate cash. Clear enough. In a service-based business,...