This paper evaluates the effectiveness of the COVID-19 temporarily led restriction on short selling by the Stock Exchange of Thailand (SET). We investigate the causal effect of short selling restriction on return, volatility and market quality from 2 September 2019 to 30 September 2020....

As the economy enters a phase transition into an aperiodic state, the tech industry finds itself at the brink of chaos. Inflated evaluations in private markets before IPOs and increasing Shannon entropy of post-IPO share prices reveal a market teetering on the edge. But is it a phase transition,...

The chaos of flow turbulence causes most quantity-of-interests J to become significantly non-convex over time, so that gradients of J soon fail to guide numerical simulations toward a useful local optimum. This challenge is investigated, and a multi-step penalty method is introduced to...