Abstract
In this paper, we outline (i) why σ‐convergence may not accompany β‐convergence, (ii) discuss evidence of β‐convergence in the United States, and (iii) use U.S. county‐level data containing over 3,000 cross‐sectional observations to demonstrate that σ‐convergence cannot be detected at the county level across the United States, or within the large majority of the individual U.S. states considered separately. Indeed, in many cases statistically significant σ‐divergence is found.
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