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 (May 21, 2026). Accessed May 23, 2026. https://oaj.fupress.net/index.php/wep/article/view/19148.