Comment by freetime2

> There are no Costco people. There are no Whole Foods people. There are no Gus’s people.

I think where you shop and what kind of products you buy says a lot about you. For example - I have two friend groups that sometimes meet up for drinks. One group drinks craft beer, fancy wine, etc. The other drinks relatively inexpensive beers and chu-hi. The experience in the two groups is completely different - everything from the conversation topics, manners, ideals, hobbies, how much people drink and for how long, etc. In both groups I have seen someone mention that they shop at a certain store, and elicit surprise from the other group members.

> In San Francisco, I live a block from Whole Foods, a block from Safeway and a block past that is Gus’s. Costco is six blocks away. We go to all of these places at various times. My gym is near Gus’s. Whole Foods has the biggest selection. Safeway has Envy apples. Costco is where we get the base load of stuff when we do weekly shopping.

I actually think this says quite a bit more about you than you may think. I can probably guess which way you vote, for instance, and where you stand on a range of social issues. I can probably guess how much income you earn, and whether you have a college degree. I may be wrong - we're dealing with probabilities after all - but demographics are real.