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@article{ Christopoulos2007,
 title = {Are US regional incomes converging? A nonlinear perspective},
 author = {Christopoulos, Dimitris and Tsionas, Mike},
 journal = {Regional Studies},
 number = {4},
 pages = {525-530},
 volume = {41},
 year = {2007},
 doi = {https://doi.org/10.1080/00343400601120254},
 urn = {https://nbn-resolving.org/urn:nbn:de:0168-ssoar-132905},
 abstract = {This article deviates from the current practice of regional convergence by allowing output convergence to follow a non-linear process. In this scenario all standard linear unit root tests have low power, thus frequently leading to misguided conclusions. In light of this we adopt a unit root test based on a non-linear model which tests the null hypothesis of a unit root against a non-linear alternative. Our findings overwhelmingly support the tendency of US regions to converge over time.},
}