Criticizing the Efficient Market Hypothesis (EMH) on the basis of highly volatile asset prices is conceptually wrong as efficiency is about rationality and information, not about stability. Speculative bubbles are compatible with rational valuation, and hence with market efficiency. As rational...

The literature has not reached a consensus yet regarding the existence of sovereign creditor moral hazard. Exploiting an exceptional historical example, this paper proposes an original method to address this issue. As the corona which is observable only during a total eclipse of the sun,...

Art is often used as an investment vehicle. Given the importance of market efficiency in finance, we use a large auction-based index to test whether the art market is weakly efficient. Evidence reveals that returns on artworks exhibit high positive auto-correlation. We attribute this result to...

In 1918, the Soviet revolutionary government repudiated the Tsarist regime’s sovereign debt, triggering one of the biggest sovereign defaults ever. Yet the price of Russian bonds remained high for years. Combing French archival records, Kim Oosterlinck shows that, far from irrational,...