When I was a kid I read a wonderful book about how a lady bought a vacuum cleaner to save time cleaning her floors. Then other people saw how great it was and bought vacuum cleaners. Eventually they were so popular that a vacuum cleaner factory was built in her town. Of course they needed more electricity to run all the vacuum cleaners and the factory, so a new power plant was also built in the city. The power plant, and the vacuum cleaner factory pumped soot into the air, which dirtied all the walls and floors across the town. Eventually with more work than she used to expend sweeping, she could get her floor almost as clean as before she bought the vacuum cleaner. I have no idea what that book was called, but the message has always stuck with me, and it seems very relevant to the topic of this post.