Özet:

The aim of this study is to examine the relationship between Bitcoin-related news and both Bitcoin price and return within the scope of time-varying causality analysis with the help of daily data covering the period 1.1.2016-4.12.2022. The existence of the said relationship was investigated using Hacker and Hatemi-J (2006)'s Boostrapt-Based Toda-Yamamoto Causality Test and time-varying causality analysis. The causality test findings obtained indicate that there is a mutual causality relationship between the news about Bitcoin and the price of Bitcoin. On the other hand, when the causality findings between Bitcoin return and Bitcoin-related news are examined, it can be said that there is no causality relationship from Bitcoin-related news to Bitcoin returns, whereas there is a causality from Bitcoin returns to Bitcoin-related news. In addition, when we look at the course of the causality relations in question over time, it has been seen that the number of news about Bitcoin increased especially during the periods when Bitcoin prices increased. In this context, it is important for individuals who will invest in both Bitcoin and altcoin market to make transactions by taking into account the news about Bitcoin and altcoin in order for the investment to be healthy.