I didn't write the article I linked in the OP.
Nor did you read it, apparently. If you had, you would have noted the ACTUAL issue being addressed (emphasis mine):
Advocates of tighter controls on dollar stores say the big chains intentionally cluster multiple stores in low-income areas. That strategy discourages supermarkets from opening and it threatens existing mom-and-pop grocers, critics say.
"The business model for these stores is built on saturation," said Julia McCarthy, senior policy associate at the nonprofit Center for Science in the Public Interest and a critic of dollar stores. "When you have so many dollar stores in one neighborhood, there's no incentive for a full-service grocery store to come in."
...
But lawmakers around the country are pushing back.
Last week, the city council in Birmingham, Alabama, unanimously approved legislation that would prohibit new dollar stores from opening within a mile of their existing locations.
...
Other local residents and business leaders worry that dollar stores' concentration in urban areas deter grocery stores, which offer a wide range of produce and healthy options, from opening.
"There are almost 100 dollar-type stores in a ten-mile radius," said Fort Worth Councilwoman Kelly Allen Gray. "They are heavily located in low-to-moderate-income neighborhoods, which makes their presence feel predatory."
100 in a ten-mile radius? Fucking hell. That's approaching Starbucks saturation.
By the way, what makes you think "business leaders" in these communities that are the ones evidently pushing the local legislatures to stop the clustering are all Democrats? Are all "moms and pops" small business owners just axiomatically Democrats in your fevered imagination?
Math fail--area goes at the square of the radius. A 10 mile radius covers 314 square miles. That's one per 3.14 square miles. Your link starts out with Starbucks at one per 1.8 square miles and the densest at one per .46 square miles.
Looking at grocery stores around here (and I live in the suburbs) I find a higher density than this. I count 12 major ones within the 16 square miles centered on our house and there are 3 chunks of a square mile each that are gated communities with no businesses at all in that and two more square miles have business space that hasn't filled in yet.
The concentration is not surprising and doesn't indicate anything devious other than to the minds of those who are determined to blame big business for all the ills of the world. Besides, what would their motive be? Why in the world would they want to keep grocery stores out??

