There are people out there who are pushing a more extreme version of self-sufficiency (most of them on the extreme left of the environmentalist movement). They want to grow all their own food (or buy it locally), provide all their own energy, create their own clothing, and so on.
What many people don't realize is that our modern lives are dependent on so many things provided by so many people that it is virtually impossible to even comprehend how many people contribute to the creation of even the simplest everyday items. To limit our choices is to push us back to a time when products were inferior and hard or impossible to come by.
Matt Ridley gives some great examples of people who try to do it on their own, making such items as soap, a toaster, and a suit. And how successful are they? Read and find out.