Fixed Cost, Zero Marginal CostWide moat

VisaNet is built for the worst second of the year. It has to authorise a transaction in milliseconds on the busiest shopping day in the busiest time zone, which means the capacity sits there for the other fifty-one weeks, paid for and mostly unused. Visa processed 257.5 billion transactions in fiscal 2025, up 10%¹, and the cost of processing the 257.5 billionth was indistinguishable from zero.

That is the whole reason the operating margin is 60%. Total operating expenses in the June 2026 quarter were $4.76 billion against $11.63 billion of net revenue², and a substantial part of those expenses are marketing, personnel and litigation rather than the running of the network itself. The rails are close to free to operate and were expensive only once.

The competitive consequence matters more than the accounting one. A rival building the same capability has to fund the same fixed cost against a fraction of the volume, which means it either loses money for a decade or charges more than the incumbent. Neither is attractive when the incumbent's price is already three cents on a hundred dollars. The toll is small enough that undercutting it is not worth anyone's capital — which is a stranger and far more durable defence than a high price would be. A network extracting three hundred basis points would have been displaced long ago.

It also means growth converts into profit at an unusual rate. Across the first nine months of fiscal 2026, net revenue rose 15% and operating income rose 17%; the gap is operating leverage doing exactly what it should. The same arithmetic runs in reverse in a downturn, but payments volume has proved remarkably resilient — it fell about 5% in 2020 while the world stopped, which is very little, though it fell in the most profitable line first.

The limit of this facet is that it is about efficiency rather than entitlement. It explains why nobody attacks Visa on price and offers no protection whatsoever against somebody who does not need to charge a price at all. Against a state-built rail costing the merchant nothing, twenty-nine basis points is not a low price; it is simply a number larger than zero.

The other limit is that the cost base is now growing where the growth is. Message routing needed almost no people; advisory, risk consulting, authentication products and Visa Direct partnerships all consume headcount. Nine-month operating expenses rose from $11.4 billion to $12.9 billion, concentrated in personnel, professional fees and network and processing. That is the right investment and it means the incremental margin on the fastest-growing revenue is lower than on the oldest.