The effect of COVID‑19 on stock market performance has important implications for both financial theory and practice. This paper examines the relationship between COVID‑19 and the instability of both stock return predictability and price volatility in the U.S over the period January 1st,...

The increasing number of online fraud cases has aroused widespread public concerns. In this paper we postulate that digital financial inclusion constitutes an important reason for this phenomenon. Using annual data of the digital financial inclusion index as well as sub-indices and fraud cases...

Hydrogen as a future energy carrier can be used for grid power peak shaving and valley filling and has thus attracted widespread attention. However, how to provide high-temperature heat for water electrolysis is an urgent challenge that needs to be overcome. This paper adopts two gas-solid...

The effect of COVID-19 on stock market performance has important implications for both financial theory and practice. This paper examines the relationship between COVID-19 and the instability of both stock return predictability and price volatility in the U.S over the period January 1st, 2019 to...