The counter decides

1. Two countries, four-fifths of the volume
   India and Brazil carry 81% of the instant payments measured across 19 economies.
2. Three explanations that fail
   Income, the age of the system and who owns it do not sort the leaders from the laggards.
3. The mechanism
   Zero user price, a common merchant QR, compulsory reach and third-party apps move the curve.
4. Speed
   Systems launched with those features scaled in two to four years; others took a decade or stalled.
5. Two ways to live with cards
   India substituted the debit card; Brazil added to cards.
6. Where growth comes from
   Instant payments supplied 94% of India's cashless growth since 2019 and 61% of Brazil's.
7. The ceiling
   Mature account-to-account markets flatten between about 100 and 190 payments per person.
8. The late movers
   The euro area mandate of 2025 and FedNow test whether features added after launch change the curve.
9. Across borders
   Domestic scale has not travelled: 27 links, mostly for tourists, with no published use.
10. The next layer
    Where a public instant system already serves the counter, a retail CBDC or a stablecoin has a narrower job.

The full essay publishes once every claim has been checked against primary sources. The chart stories in this chapter carry its evidence today.