Abstract
In this paper, unexpected market excess returns are decomposed into permanent cash-flow news, temporary cash-flow news, and discount-rate news by using a log-linear SVAR model, and the profitability of momentum strategies is analyzed under these news states. The empirical results are as follow. Frist, Momentum returns exist in the US stock market. Second, momentum profitability exists under both permanent and temporary cash-flow news states. This supports the results of Celiker et al. (2016) that momentum profitability exists in the US stock market under cash flow news states. Third, the momentum effect is strong even under the discount-rate news. Finally, Momentum profitability is stronger when the overall market is in an up market. In other words, when the market is up, investors tend to be overconfident, which creates momentums. This paper can analyze which factors play an important role in determining momentum returns by estimating permanent and temporary cash-flow news and discount-rate news by using the developed news decomposition method.
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