Roads are taken for granted in my home state of Michigan, birthplace of the automobile.  Most of us can’t picture getting somewhere except by car, and so a community unreachable by car is simply a community unreachable.  An inaccessible community is also made irrelevant to the larger market economy because it is too difficult to reach and too small of a market to make the effort of exchange profitable. For this reason, members of these communities are compelled by necessity and convenience to produce as many of the goods consumed by their household as possible.