In In the Midst of Alarms (1894) by Robert Barr, a man was talking about a self-sufficient people in a Canadian village, saying:
“Why, that this is the proper way to live. Old Hiram has an anvil and an amateur forge. He can tinker up almost anything, and that eliminates the blacksmith. Howard has a bench, saws, hammers, and other tools, and that eliminates the carpenter. The women eliminate the baker, the soap boiler, and a lot of other parasites. Now, when you have eliminated all the middlemen, then comes independence, and consequently complete happiness. You can’t keep happiness away with a shotgun then.”
I know the literal meaning of "You can’t keep happiness away with a shotgun then", but what does it have to do with being self-sufficient?