Visa Inc. ( V ) and Mastercard Incorporated ( MA ) share an extraordinarily durable duopoly built on scale, network effects, and secular digital payment growth. Even though Mastercard is growing faster and tends to innovate more, II focus on producing objective, data-driven research, mostly about small- to mid-cap companies, as these tend to be overlooked by many investors. From time to time, though, I also look at large-cap names, just to give a fuller sense of the broader equity markets.Analyst’s Disclosu ...