The consequences of price informativeness have been extensively studied in the past. In contrast, this study goes a step backward to explore its determinants by examining whether belief diversity facilitates a complete and timely reflection of earnings news into prices. Using a global dataset, we find a higher abnormal return variance ratio (lower post-earnings announcement drift) in the presence of more diversely-informed beliefs among traders. This inference holds despite several robustness checks. Moreover, the cross-country analysis reveals that the documented impact of belief diversity intensifies in countries with higher market development, greater corporate transparency, and stronger investor protection.