Because implied volatility is essential for pricing options, analyzing derivative strategies and measuring risk in investment portfolios containing derivatives, understanding variations in implied volatility also becomes vital. Aside from a secular trend, volatility clustering and calendar...

How does emotional expression in online reviews affect sales? To answer this question, a model is constructed based on theories of sentiment. This model is tested experimentally. Controlling for online review valence online review emotionality affects product sales. The impact is moderated by...

A Granger Causality study is conducted to understand the causality loop between online reviews and consumer acquisition in YouTube. This paper aims to refute the long-lasting assumption that online reviews are exogenous to sales. By doing so, this paper posts a challenge in understanding the...