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1 See https://www.paymentscardsandmobile.com/unionpay-stays-on-top-as-the-worlds-largest-card-scheme/.
2 See page 6 of https://www.mckinsey.com/~/media/McKinsey/Industries/Financial%20Services/Our%20Insights/Global%20payments%20Expansive%20growth%20targeted%20opportunities/Global-payments-map-2018.ashx.

