Why does McKinsey’s report (see URL) imply cross-border flow is in hundreds of trillions of $ ? What does cross-border flow mean in the report?

Reference: A vision for the future for cross-border payments. The cross border flow implies the cross-border payments that are made between two countries. The B2B (Business-to-Business) cross-border payments market is huge! No one has an exact estimate, but it is believed to be more than US$ 50 Trillion and probably closer to the US$ 100-125 […]

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