| Popis: |
This paper examines the effects of futures trading on the jump risk in the Bitcoin market. We use a nonparametric method to detect Levy-type jumps in Bitcoin prices and obtain jump risk measures (jump intensity and jump size) of big and small jumps by using 5-minute high-frequency data, and document that Bitcoin has obvious features of Levy jumps, i.e., prices include both big jumps and small jumps, and the jump risk is time-varying. We then investigate the changes of these jump risk measures before and after the introduction of the Bitcoin futures, and we find that the jump size of big and small jumps decreases after the introduction of Bitcoin futures, while the big jump intensity increases. Further, we examine whether greater futures-trading activity (volume and open interest) is associated with greater Bitcoin jump risk and document that, on the one hand, there exists bidirectional causality between unexpected volume and jump intensity and size of Bitcoin and the impulse response function analysis show that the shocks have temporary increasing effects, and the speculative trading in the futures market will increase the jump risk. On the other hand, unexpected open interest Granger causes jump risk but the inverse is not true, indicating that investors are unlikely to hedge jump risk by using Bitcoin futures. These findings disclose the fact that the hedging function of the Bitcoin futures does not work well and the functions of Bitcoin futures need to be further improved. |
