According to the text regarding specialization, which type of designer holds more negotiating power due to measurable business impact?

A designer who points to a 15% increase in sign-ups from a redesigned checkout flow

The text emphasizes that the highest rewards go to designers who focus on measurable business outcomes rather than just visual appeal. A designer who can quantify their contribution—such as demonstrating a specific percentage increase in conversion rates (like sign-ups or purchases) directly resulting from their design work (often a UX/UI function)—possesses significant negotiating power. This ability to link design decisions to hard business metrics demonstrates critical value to a company's bottom line, placing them in a much stronger position than those who deliver aesthetically pleasing but unquantified deliverables.