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Show HN: Daily price tracking for Trader Joe's

traderjoesprices.com

81–90 of 154 posts

Re: Show HN: Daily price tracking for Trader Joe's

#81
post #28

Earlier quoted context omitted.

Haha true. I should fix that.

I'd also change it to `Referer`, as that is what Chrome seems to be using. And referrer is set twice!

Indeed, he spelled it the right way, which is the wrong way. He should spell it wrong, which is the right way. :)

I think it is funny that this misspelling hasn't been fixed after all of these years. It was typo'ed in the original http spec in 1996: https://en.wikipedia.org/wiki/HTTP_referer

Re: Show HN: Daily price tracking for Trader Joe's

#82
post #36

Earlier quoted context omitted.

TBH, people routinely overlook the other two factors, supply and underlying cost. Sometimes increases in demand can both increase supply and decrease cost.

“Underlying cost” is part of the supply curve.

Ok, imagine the cost is driven by underutilized fixed costs. How does the supply curve model the decrease in cost as demand increases?

Re: Show HN: Daily price tracking for Trader Joe's

#84
post #46

Earlier quoted context omitted.

Trader Joe's prices are famously the same across all stores. So that shouldn't be an issue.

That's a misconception. Prices are not the same across stores. I live in Los Angeles. Many times I've shopped at the TJ's in Silver Lake and one of the TJ's in Pasadena on the same day. Most prices are the same, but on many items the Silver Lake store is consistently 5-10% higher. I've also shopped in midwestern TJ's and noted that the prices were generally lower than LA. Products differ significantly, too. Items wit…

Are you sure?

They list prices on their website even without a local store selected. And then picking a local store in different locations, I can't find any prices that change.

I mean, obviously there might be exceptions. And I assume local produce varies, the same way it varies in every supermarket not just by the season but by the week. Most fresh produce isn't even listed on their site, and things like fresh salads are going to be based on local produce prices. (E.g. this daily price tracker doesn't have any entries for apples of any kind, for instance.)

But I can't find any evidence of any Trader Joe's products (whether frozen or snacks or jarred or bakery) having different prices between stores. Which is what I meant -- the stuff on their website. But it's good to clarify the difference between that and fresh produce.

(I could always be wrong, but you can find it repeated all over forums that Trader Joe's prices are the same everywhere, and they are in my experience as well -- it seems to be "common knowledge".)

Re: Show HN: Daily price tracking for Trader Joe's

#85
post #77

Earlier quoted context omitted.

Econ 101 explains those counter examples as well: Food has high demand but lots of competition and easy substitution (rice expensive? buy pasta). Housing supply is limited (by location but often artificially via regulation) and substitution is difficult (have to move).

How many recessions has "Econ 101" predicted? Economics is a "soft science", on the same tier as psychology which people love to ridicule. Understanding how rational actors behave in a microeconomic sense doesn't help you when you're talking about irrational actors in the macroeconomic sense

The basics of Supply and Demand, Price Elasticity, Inflation, Monopolies, etc. etc. don't require humans to be perfectly rational actors to be useful concepts.

Yes, Economics can't predict recessions or the next Beanie Baby fad, that doesn't mean supply and demand is nonsense.

Re: Show HN: Daily price tracking for Trader Joe's

#86
post #54

Earlier quoted context omitted.

Econ 101 explains those counter examples as well: Food has high demand but lots of competition and easy substitution (rice expensive? buy pasta). Housing supply is limited (by location but often artificially via regulation) and substitution is difficult (have to move).

People are not economically rational. Most people don't buy pasta when rice is expensive. Econ 101 explains rational actors in a vaccum, not gluten free, asian culture, anti Italians sentiment, or hatred of Monsanto.

> Most people don't buy pasta when rice is expensive.

They would if rice prices went through the roof, which they won't because people who sell rice are not stupid.

Econ 101 certainly explains why you can actually buy gluten free products now (supply for demand) and why gluten free products are usually more expensive (niche market).

My ECON 101 prof talked about the limitations of models and theories based on assumption of rational actors in the 1980s ... I have no idea why everyone thinks this is a gotcha.

Re: Show HN: Daily price tracking for Trader Joe's

#87

Earlier quoted context omitted.

I'd love it if Apple (since they appear not to sell data) would provide an anonymized receipt analysis service like this. Huge user base right off the bat.

I wish there was just a standardized receipt sending format that would send your receipt to your pay app once you tap to pay something. Of course, I can only imagine this coming to fruition if it is packed to the brim with tracking and 3rd party dissemination.

To the brim, for sure.

Probably one day we'll have a "citizen preferences file" where the confidentiality of our interactions with various entities can be granularly set.

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