Store Currency and Permanent Setting

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I am only new to Shopify and I love it thank you.

I have set the store currency to USD from Settings > General > Store Currency and I have created a currency selector menu for AUD by a link  If the first customer selects AUD as their chosen currency to view the website and pay at checkout, does this mean that the store currency setting(from Settings > General > Store Currency) will now be set to AUD as it is the first sale?