How do individuals change their behavior when abortion access increases? In this innovative book, economist Phillip Levine uses economic analysis to consider this question, comparing abortion to a form of insurance. Like insurance, he contends, abortion provides protection from downside risk. A pregnant woman who would otherwise give birth to an unwanted child has the option to abort. On the other hand, the availability of this option may increase the likelihood of a pregnancy in the first place.

In a very restrictive abortion environment, few women would choose to have an...