The typical Costco shopper: a 39yo Asian American woman earning over $125k/yr
businessinsider.com
businessinsider.com
How do they know that? Where is the data coming from? What’s the sample size? And any academic study this would be basic questions
"Roughly one-third of US shoppers are Costco customers," says the article, and Asian Americans are 5.7% of the US population.
I'm not sure how you'd get that 5.7% to be the "average" of any one-third of American shoppers, unless you're tying it to something else.