(average) Tobin's Q increases with firm-level volatility. The significance mainly comes from R&D firms, which have more growth … options than non-R&D firms. By decomposing firm-level volatility into its systematic and unsystematic part, we document that … only idiosyncratic volatility has a significant effect on valuation. Second, we analyze the relation of stock returns to …

volatility as well as the U.S. economy. We find that - even after accounting for these factors - oil price uncertainty still has … confirms these results. Finally, significant spillover effects in the GARCH model suggest that oil price volatility is a gauge …