Campbell Covid Q1
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If one state, say Arizona, substantially reduces social distancing, and another state, say California, does not, California’s efforts could be undercut by Arizonans traveling to California. There has to be a single national decision about when to end our shutdown. Purely as a practical matter, let alone a legal one, states cannot quarantine all travelers from other states. This is a textbook example of where a national approach is essential. It is, therefore, a mistake to say the decision is up to each state, with the federal role only advisory.