روابط بازده سهام و اوراق قرضه و عدم اطمینان بازار سهام: شواهد از تحلیل موجک

This paper adopts continuous wavelet analysis to investigate the time variation features of stock-bond return relations across different frequencies from 1988 to 2014. We also examine whether the time-varying relations can be linked to two dimensions: fundamental economic factors and stock market uncertainty. The empirical results show that the short-term and long-term dependencies between stocks and bonds do vary over time. In addition, the relations between stock and bond returns have positive sign sensitivity to the short rate and the slope of term structure, while their sensitivity to stock market volatility is negative. Moreover, the impact of crises on the long-term stock-bond relation is significantly negative but the impact on short-term relation is significantly positive. Overall, the fundamental economic factors which drive the stock-bond relations do not vary across time frequencies; however, the impacts of crises do vary across the time frequencies. The findings have economic implications to help investors determine their portfolio allocations. Furthermore, these results also help policy makers monitor the financial markets and adjust the macroeconomic policies by observing changes in these state variables.