424 PART SIX THE ECONOMICS OF LABOR MARKETS 16, while others require attendance until age 17 or 18. Moreover, the laws have changed over time. Between 1970 and 1980, for instance, Wyoming reduced the school-attendance age from 17 to 16, while Washington raised it from 16 to 18. This variation across states and over time provides data with which to study the effects of compulsory school attendance. Even within a state, school-attendance laws have different effects on differ-ent people. Students start attending school at different ages, depending on the month of the year in which they were born. Yet all students can drop out as soon as they reach the minimum legal age; they are not required to finish out the school year. As a result, those who start school at a relatively young age are required to spend more time in school than those who start school at a relatively old age. This variation across students within a state also provides a way to study the effects of compulsory attendance. In an article published in the November 1991 issue of the
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Compulsory education, Brett Favre, compulsory school attendance