Asymmetric Co-integration based on Nonlinear ARDL: Evidence from Tehran Stock Exchange

Investing in the stock market is very important as a profitable opportunity in the economy. The purpose of this article is to investigate the asymmetry in the amount and direction of the influence of exchange rate impulses and global crude oil prices on stock returns in the Tehran Stock Exchange. For this purpose, daily data (2011:11:26--2021:3:19) and the Nonlinear Autoregressive Distributed Lag Model approach of NARDL have been used. The results of Pesaran et al.'s co-integration test (2001) showed the existence of long-term relationship between stock returns with exchange rate and global crude oil price. In the following, based on the results of the Wald test and the research model, the asymmetric effects of exchange rate shocks on stock returns in the short and long term were confirmed. In the short term, positive exchange rate impulses on stock returns were not significant. Also, in the long term, the effect of negative exchange rate shocks is more than its positive shocks on stock returns. The impact of oil prices on stock returns was confirmed in the short term. The findings of the research showed that the exchange rate has a greater impact on stock returns in the Tehran Stock Exchange than the price of oil.