Is GDP the relevant metric to assess this? On credit/debit card transaction volume North America represents 40+% of global market. https://www.capgemini.com/r

Is GDP the relevant metric to assess this? On credit/debit card transaction volume North America represents 40+% of global market. https://www.capgemini.com/resource-file-access/resource/pdf/wpr_2013.pdf https://www.capgemini.com/resource-file-access/resource/pdf/...