Let's put it this way. Imagine the town of Weston is 10 times wealthier than the town of Easton, and they border each other with nothing more than a line in the road. Do you honestly think any kind of intervention will stop the flow of job seekers from Easton to Weston?Now if the wealth gap is no more than let's say 2 to 1, maybe not so bad. but when it's 10 to 1 or maybe even 20 to 1, some will risk their lives for it.
Why can't that town fix itself instead of running to the other town? If Easton people flood Weston, then both Weston AND Easton will eventually become poor.