Urban spillover counties show the most profound, sustained, and
propitious aggregate income effects. Total income (unpictured) exhibits
positive and significant effects throughout most of the period following
the completion of all treated county highway segments. It is
accompanied by positive, significant population differences throughout
much of the period and statistically significant total earnings
differences during the final three years. However, the total earnings
effect is not as large as the total income effect, indicating that part
of the income effect is the consequence of residential decentralization
and income sources tied to new inmigrants (transfer payments and
dividends, interest, and rent). Residence adjustment turns positive in
1974 and achieves a statistically significant result for five of the
last six last years. This effect is accompanied by positive and
statistically significant transfer payment income differences. This
latter result suggests that interstate highways may attract older
inmigrants to outlying areas of urban areas, which become more appealing
as residences when served by interstate highways.
Urban spillover counties show the most profound, sustained, andpropitious aggregate income effects. Total income (unpictured) exhibitspositive and significant effects throughout most of the period followingthe completion of all treated county highway segments. It isaccompanied by positive, significant population differences throughoutmuch of the period and statistically significant total earningsdifferences during the final three years. However, the total earningseffect is not as large as the total income effect, indicating that partof the income effect is the consequence of residential decentralizationand income sources tied to new inmigrants (transfer payments anddividends, interest, and rent). Residence adjustment turns positive in1974 and achieves a statistically significant result for five of thelast six last years. This effect is accompanied by positive andstatistically significant transfer payment income differences. Thislatter result suggests that interstate highways may attract olderinmigrants to outlying areas of urban areas, which become more appealingas residences when served by interstate highways.
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