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I was curious if this was true so I looked it up. AmEx + Discover have 20% - 25% market share depending on the metric you care about. Bing + DDG have 8%

https://wallethub.com/edu/cc/market-share-by-credit-card-net...

https://gs.statcounter.com/search-engine-market-share/all/un...

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The stats are all over the place. This report says Amex + Discover is ~11% of US purchase volume in 2019. https://nilsonreport.com/publication_chart_and_graphs_archiv...

The article references [1] which says,

"Visa holds a 60% share of the credit and debit card market, followed by Mastercard with 30%, according to Ellis, with American Express far behind at 8.5%."

That puts Discover + AmEx at 10% or so.

1. https://www.reuters.com/article/us-visa-mastercard-stocks/sw...

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