Öz
China reported the first COVID-19 case to the World Health Organization on 31.12.2019. however, the virus spread to many countries, including Turkey, in a short time. In addition to the healthcare system in these countries, COVID-19 affected stock markets, exchange rates and macroeconomic variables, as well. In this study, causalities are examined for the pre-COVID-19 (05.09.2018 - 30.12.2019) period and
the COVID-19 (31.12.2019 - 22.04.2021) period in order to determine the relations between BIST100 and PARTICIPATION50 indices and Dollar and Euro. Causalities are examined by using frequency domain causality test. Pre-COVID19, it is found that unidirectional causality from Dollar to PARTICIPATION50 index in the short-run. However, this causality is found from Euro to this index for all sub-periods. It has
been determined that the traditional approach is valid between the PARTICIPATION50 index and the exchange rates. It is seen that there is bidirectional causality between BIST100 and Euro in the short-run. Other findings show that there is unidirectional causality between BIST100 and exchange rates in the short, medium and long-run. It is found that there is bidirectional causality between PARTICIPATION50
index and Dollar for all sub-periods in COVID-19 period. It is also seen that there is bidirectional causality is between BIST100 and Euro in the short-run. During the pandemic period, other findings show unidirectional causality between stock markets and exchange rates. When all the findings are evaluated, it is seen that there is an increase in the causalities between indices and exchange rates in the COVID-19 period compared to the pre-COVID-19 period. The pandemic creates a break that ascends the causalities.