OK, cities are special cases, and industrial production doesn't fit the Leviticus paradigm very well. So how does one translate the principle of "not reaping to the edge of your field" into action in a modern environment?
One trivial thing I've done, or rather not done, is not pick up lost money. I used to, but after a while figured that a kid finding the dime would get more joy out it than I would, so I started letting it lie undisturbed, graduating to larger denominations over time. (I've never seen the original owner find it again, or even look for it.) There's no nobility in that--I can do without that dollar bill caught in the bushes without breathing hard (it isn't really even explicitly mine anyway)--I'm just trying to get a handle on the right attitude by being faithful in the least things. Least things first.
If you work in sales, you can cut the price a bit and take less commission if the client is poor. I don't know how many do that. Doctors and some lawyers sometimes do pro bono work. That's one equivalent of not gleaning to the edges. But if you're a janitor, or an IT manager, what's the equivalent? Giving money away is not the same thing at all. Widows and orphans and the disabled--yes, they often need direct support. But gleaning the ungleaned was work for the able-bodied without land or adequate employment of their own--they got food and self-respect and to be a model for their kids.
Another detail of the context is different: maintenance of a home is much harder. In most places around here you don't get to build without a plan for water and power and heat--and utility costs and taxes mean you need a non-trivial revenue stream just to stay in one place. That's not including repairs, which are an expense with houses anywhere. So either we should talk about a different paradigm for low cost housing (like the tiny house movement--but heating is a really big deal in winter!), or a "gleaning the ungleaned" that earns money.
I'd rather not reinvent the wheel here. Some folks are bound to have put some thought already into American equivalents of "gleaning the ungleaned," and some of that is probably useful. There'll be no silver bullet, of course--even the tiny houses have issues. (Imagine a little collection of them. Now imagine who will be staying in the neighborhood a year later.) I'm dubious of top down plans, unless the top dog happens to be God, and very few of the top dogs are.
Can anybody point me at who has done some reasonable work in this area, or thought through pros and cons?