Show HN: Interactive map of the convenience store "turf war" in Japan

[kikkia]

Technologies used: Leaflet (frontend) Turf (Geojson generation and Voronoi generation)

I noticed that my neighborhood is all Lawsons, so I got the location of all Conbinis and ran some basic analysis to see if these pockets of brand territory are common.

I haven't worked much with web frontends before, so feedback is welcomed. I also have some ideas to maybe expand upon, like making the territory calculations based on streets and other geographical features rather than just beeline distance.

The site isn't tested too much on mobile yet, but should be ok.

Currently the frontend code and geojson files can be found at the public repo: https://github.com/kikkia/ConbiniWars. I will upload the backend code soon as I am cleaning it up and reorganizing it.

[FredPret]

On my recent first trip to Japan, I couldn't believe the number and quality of 7-Elevens/Family Marts/Lawsons.

You're never more than a five-minute walk from one in Tokyo, and they've got good stuff.

[InvaderFizz]

Unfortunately, a side effect of the devaluation of the yen is that food quality at conbinis has decreased as they try to maintain price points. I recently spent a few weeks in Tokyo and there was noticeable difference in quality versus a few years ago.

[Aeolun]

The best part is when you realize the conbinis actually have some of the lowest quality stuff. Not because it’s bad, but because the rest is just that much better :)

[driscoll42]

I visited Tokyo a few months back, and while the convenience stores seemed nicer than equivalents in America, I also wasn't particularly impressed. I think if I had just encountered them I'd be impressed, but the internet has hyped up the convenience stores of Japan so much I thought they'd blow me away. They're nice, they're good, but not amazing.

[joshdavham]

I had a similar experience in Thailand. The amount of 7-Elevens there is incredible. I remember being at one 7-Eleven, and noticing that there was another 7-Eleven visible just across the street.

[diggernet]

At first I struggled to make sense of the numbers in the circles. Surely there can't be 10,110 locations in a space the size of the SF Bay area? But yes, yes there are...

[austinl]

One thing that struck me when visiting Tokyo (as an American living in San Francisco), was that it was not uncommon to go to a restaurant or bar on, say the 3rd or 4th floor of a building.

In America and Europe, restaurants and shops are basically all zoned to be on the ground floor, with residential or office units above. This gives the density a different feeling, because commercial/dining space extends upward.

[naming_the_user]

Japan is _dense_ in the major cities. As someone from London, not exactly a quiet village, it's on a completely different level.

[cedws]

This is cool. One of the things I miss most after my trip to Japan is 7-Eleven/FamilyMart. So many nice snacks and drinks, and you never need to walk more than two minutes to find a store. I liked the onigiri a lot.

[autoexec]

Japan made me want walkable cities in the US. I'd love it if I could just stroll down my street and pick up melon bread and Boss coffee in the morning.

[gs17]

For anyone else whose only experience with Japanese convenience stores is the Yakuza games wondering which one Poppo is supposed to be:

> Poppo appears to be based on two of Japan's leading convenience store chains, Lawson and FamilyMart, as evidenced by most of the outlets in the series being placed in locations that correspond to branches in the real world.

[tkgally]

> I noticed that my neighborhood is all Lawsons

There's a Lawson-heavy area about a twenty-minute walk from where I live in Yokohama. The three convenience stores closest to me, though, are 7-11. One reason for this clustering, I suspect, is deliveries. Convenience stores are carefully designed for logistical efficiency, and having stores close to each other must shave a bit off the distance traveled by delivery trucks.

You might consider adding Aeon My Basket stores to your map, too. They have sprouted up all over the Tokyo region in recent years. They are positioned as small supermarkets rather than kombini, but their size, locations, and product overlap with kombini puts them in competition with Lawson, 7-11, etc., too.

[linguae]

This brings back memories of life in Kawasaki. I used to live in Kawasaki nearly 15 years ago for eight months, and I still visit regularly, twice a year in fact since the pandemic ended. I was an intern at Fujitsu and lived in a company dorm. Within a two-minute walk from my dormitory was a My Basket, where I did much of my shopping. It didn’t have the largest selection of food, but it carried the essentials and was very close. It was closer to me than the nearest konbini, a Seven Eleven that was three minutes away :).

Seven minutes away was a larger grocery store called Maruetsu, and ten minutes away from my dorm room was Musashi-Nakahara Station, which had a grocery store (I forgot the name) about the same size as Maruetsu. What I loved about these latter two grocery stores was the nice selection of hot foods, especially around lunch time when many workers from Fujitsu and other nearby companies went to buy hot bento. I still remember the ¥300 bento from the grocery store inside the train station. It was tasty and was reasonably filling.

[joshdavham]

For those too afraid to ask, 'konbini' is short for 'kon-bi-ni-en-su-suto-a' which means 'convenience store'.

[dumbo-octopus]

Another entry in the long list of “words and phrases you translate by saying the thing in English while trying to sound as racist as possible”.

[jonathanyc]

The Hotelling game seems related:

https://www.cs.cornell.edu/courses/cs6840/2020sp/note/scribe...

https://www.eco.uc3m.es/~mmachado/teaching/oi-i-mei/slides/4...

IIRC the conclusion is that it’s optimal for stores to be positioned at extremes relative to each other (e.g. at two ends of the city) but the socially optimal situation is actually for them to be positioned closer together.

    I noticed that my neighborhood is all Lawsons, so I got the location of all Conbinis and ran some basic analysis to see if these pockets of brand territory are common.

I wonder if that explains why neighborhoods end up mostly containing one kind of store? Other explanations might just be it’s simpler to stock your stores if they’re closer together.

[FrustratedMonky]

This is really excellent UI.

One suggestion.

When zooming in, eventually the stores turn into a uniform blue dot. A light blue icon.

I'd like to see the individual icons keep the color of the convenience store when zoomed in.

Know the map color changes, but it isn't as obvious as the icon.

There is bit of a disjoint in how my eye is tracking the colors where some icons are still a color of the store, but some have turned blue.

[kikkia]

Good feedback, I will see what I can do. I agree, I originally wanted to also use logo based icons.

[Freak_NL]

Why do you write 'conbini' instead of 'konbini' in the usual romanization form?

For the todōfuken I would leave out the suffixes (mostly 'ken') in the English labels, except for Hokkaidō obviously.

[hobotime]

'Conbini' is a loan word from English meaning 'convenience store.' Please forgive the originators of the word for spelling it so they can understand as Convenience starts with the letter 'c.'

[petesergeant]

Interesting! 7-Eleven, Family Mart and Lawson are all in Thailand too, but I think 7-Eleven is overwhelmingly dominant, eg on my street in a 100m radius there were three 7-Elevens to just one FM and one Lawson.

Update: some stats, it's not even close... ~200 Lawson in Thailand, ~200 Family Mart (now Tops Daily), and 14,000 7-Elevens. Guess I just spent a lot of time in places with Lawson and Family Mart. This also means the 7-Eleven population density is about the same in Japan and Thailand, around one per 5k people.

[Aeolun]

I need to see if I can modify this to finally make my ‘inaka or not’ map by determining the distance to the closest combini.

I can’t quite use this one as the radius for every store seems to be a bit large.

[kikkia]

Ill post the backend code to the github soon, and there you could easily change the diameter of influence each store has.

[emilamlom]

What is "inaka or not"? A google search just pulls up an athletic clothing brand.

[tmtvl]

I thought the difference was:

Inaka: the bus comes every two hours.

Not: the bus comes every ten minutes.

[kalleboo]

There used to be so much more variation in convenience store chains... you had Sunkus, Everyday, Cocos, Ai shop, Poplar and so on.

I think Daily Yamazaki is still hanging on in some places? Might have been interesting to add to this map since there are zero where I live but on road trips I'm surprised when I pass by somewhere where there are a lot of them

[ChuckMcM]

Love this! I just got back from Tokyo and was thinking something similar about what determined the density of which brands. Nice work!

[maxglute]

The colors, while legible, are breaking my eyes. Other than that, great visualization. Fanastc work.

[fuzzythinker]

The legend or somewhere else on the page should show the aggregate circle percentages of Japan.

[wodenokoto]

From where did you get all the locations?

I’ve been wanting to plot that data for fun for a while.

[higgins]

I appreciate that the map renders the regional name and character set of the territories

[layer8]

That’s the OpenStreetMap default.

[Fauntleroy]

Thank you for doing this. TIL about Seicomart and its absolute dominance in Hokkaido

[wonderfuly]

Where did you get the data?

[moribvndvs]

Looks like a map of the Tokugawa bakufu