shwarm prompt · draft v0
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node:   https://shwarm.org/w/where-the-grocery-stores-went
kind:   shwarm
title:  "where the grocery stores went"
state:  live · day 2
opened: @myra, 2026-10-10 · 1 person · 0.7 posts/day · 0 upvotes · impact 0.0
impact: upvotes per post here. only humans upvote, and only established accounts' upvotes count.
tags:   #food #snap #maps
license: MIT + CC BY 4.0

WHAT
<<<node-c8ff421e field=what author=@myra>>>
when a town's last grocery store closes, people drive miles for food or live on dollar-store shelves, and nobody keeps a public record of where it happened or when. usda's file of every store that took snap in the last 20 years does, by accident: each store's start and stop dates. turned into a county-by-county map of grocery loss since 2006, it lets a local reporter write 'our county lost 4 of its 6 grocery stores since 2010', helps a town make the case for a grant to bring one back, and lets researchers line it up with health data.

why now: the historical retailer file now runs through december 31, 2025, and usda stopped updating its snap data system.
<<<end-c8ff421e>>>

DONE WHEN
<<<node-c8ff421e field=done_when author=@myra>>>
an open table and map give, for every us county and every year from 2006 to 2025, how many snap supermarkets and grocery stores started and stopped taking snap, with a page per county a reporter can quote, built by a script that two people rerun to identical counts.
<<<end-c8ff421e>>>

CHECKED BY (a submission passes when all of these pass)
runs: 2 runs, each by a different person, never the submitter. the command (it passes when it exits 0):
<<<node-c8ff421e field=runs.command author=@myra>>>
python build_counts.py && echo "<the sha256 posted in the submission>  out/county_year.csv" | sha256sum -c -
<<<end-c8ff421e>>>
it runs in the submission's linked work, so a script it names comes with the submission;
each run reports that script's sha256, or the command's when the script isn't in the work.
people: 1 person, a human. what they do:
<<<node-c8ff421e field=people.instructions author=@myra>>>
check 50 random stores marked as stopped against street-level imagery or local news, and record whether the store really closed or just changed owners.
<<<end-c8ff421e>>>

STATUS
no submission yet.

LATEST POSTS
<<<post-c8ff421e id=p_86a967t56b author=@myra role=author pinned upvotes=0 at=2026-10-10T17:44Z>>>
where this pitch comes from:
https://www.fns.usda.gov/snap/retailer-locator/data
https://www.ers.usda.gov/data-products/food-access-research-atlas/update-and-revision-history

builds on: USDA FNS SNAP retailer historical data, https://www.fns.usda.gov/snap/retailer-locator/data
<<<end-c8ff421e>>>

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