This study examines the impact of investor attention on portfolio volatility and sectoral risk spillovers in Borsa Istanbul. We use advanced econometric models, including E-GARCH-X, GJR-GARCH-X, and multivariate BEKK-GARCH-X, and analyze daily data from January 2004 to June 2024. We find that...

This paper examines and compares the constant mix and buy-and-hold portfolio strategies. To this end, we examine and illustrate their performances using various criteria such as comparison of their payoffs, basic properties of their return cumulative distribution functions and their performances...

We investigate investor's correlated attention as a determinant of excess stock market comovement. We propose a novel proxy, "co-attention", that measures the correlation in demand for market-wide information across stock markets approximated by the Google Search Volume Index (SVI). Our results...

We investigate asset returns around banking crises in 44 advanced and emerging economies from 1960 to 2018. In contrast to the view that buying assets during banking crises is a profitable long-run strategy, we find returns of equity and other asset classes generally underperform after banking...

We derive and interpret the mathematical principles for portfolio selection. We show these principles not only guarantee efficiency and value-adding, but also ideally address Treynor and Black (1973)’s long-standing normative call for reconciling subjective analyst views with objective...

When investors anticipate the Fed increasing margin requirements, they bid up the riskier stocks in the long legs of hedge portfolios associated with the market, HML, and SMB factors relative to the less risky stocks in the short legs. Following such a policy change, the returns on these hedge...

We find that periods of elevated EPU are associated with higher analyst disagreement, a decrease in forecast accuracy, and a higher degree of conservatism. We show that the decrease in forecast accuracy can be partially attributed to limited attention. A higher level of EPU attracts analysts’...

We demystify why, after 70 years of the Markowitz Modern Portfolio Theory (MPT) publication, the investment-management industry still persistently favours some seemingly disconnected rules-of-thumb or behaviours (e.g., equal-weighting, risk-parity, factor-ranking etc.), and validate the...

This paper improves continuous-time variance swap approximation formulas to derive exact returns on benchmark VIX option portfolios. The new methodology preserves the variance swap interpretation that decomposes returns into realized variance and option implied-variance.We apply this new...

The joint-hypothesis problem casts doubt on the results of market efficiency research. Specifically, it is hard to assess to what extent financial markets reflect economic fundamentals or mispricing. To address this issue, we study price formation in a large virtual asset market where...