Where did I say anything about tracking a particular dollar?Your entire post discussed the circulation of money in the local economy, and said nothing whatsoever about money coming into the local economy. Unless Walmart plans to keep providing your local economy with low cost steaks forever, and get nothing in return, money will eventually need to return. But it might be a different dollar bill spent by a different purchaser.
If I spend my money at a local restaurant that uses local produce/local products and is a small business, that's much better for my local economy than going to say Outback Steakhouse/Olive Garden etc. where they don't pay their employees well and the money I've spent is literally leeched out of my local economy.
If the money leaves your local economy, that's a good thing. It means you traded some inedible green paper for a delicious steak. Your community has gained, the outside world has lost. If, in turn, someone trades green pieces of paper for products produced in the community, you gain less - you gain 1 steak but lose some eggplants. (Of course, the community with a surplus of steaks and a shortage of eggplants considers the opposite trade a gain.)
It wouldn't surprise me if walmart destroys retail jobs - they are fantastically efficient. Computers and the internet have also destroyed many jobs (newspapers, for example). Money no longer circulates around the local economy. Is this also a bad thing?
Destroying jobs through increasing productivity is generally a good thing.
I've discovered a very enlightening way to think about such questions: explain the harm in terms of goods and services, without mention of green pieces of paper. E.g., "the housing bubble was bad because we labor and materials building houses we didn't need." Can you provide a similar explanation of the harm caused by walmart?
It's moral not to put my neighbors out of business and look out for one another.
Why is it moral to put a much poorer Chinese person out of business? Is the Mexican farmer selling goods to Walmart somehow less of a human being than your wealthy neighbor?