Lending an ear to Deuteronomy

The Freakonomics Blog looks at Deuteronomy 23:25-26 finds some “limits on altruism:”

When thou comest into thy neighbor’s standing corn, then thou mayest pluck ears with thy hand; but thou shalt not move a sickle unto thy neighbor’s standing corn.

I take this passage to mean “everyone’s entitled to infinitesimally small portion of your crops if they really need it (certainly if they’re starving), but for anything more than a handful, start your own field.”

There would seem to be implications in there for taxes, gifts, property rights, etc. Leave your interpretation in the comments.