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What's a Layer of Swiss Cheese?
The author uses the swiss cheese analogy to explain how safety systems fail or protect us. If you're rich, your wealth might be a layer of swiss cheese protecting you from accidental harm. But if you are poor, it might be a hole in your swiss cheese making it more like that your mistakes are not survivable. The book also looks at social and economic conditions as well as physical ones such as whether government is enforcing housing laws against your landlord.