Bernd, Frick, Daniel Kaimann, Clarissa Spiess Bru, and Rob Simmons. “Regional Variations in the Returns to Credible Signals of Product Quality: Empirical Evidence from the German Wine Industry”. Wine Economics and Policy 15, no. 1 (May 21, 2026): 101–114. Accessed July 16, 2026. https://oaj.fupress.net/index.php/wep/article/view/19148.