It is not police protection that makes one rich, the other poor. The differences in personal wealth that arise in any society—barring special privileges granted by government—are due either to accident or to qualities inherent in the individual: industry, thrift, abstinence. But it so happens that those who have and exercise these qualities do not injure others; their very substance indicates that in acquiring it they have benefited their fellowmen. If I become rich by making and selling shoes, it follows that many people have found my shoes desirable, and they have thus profited by my
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