In this study we investigate possible long-range trends in the cryptocurrency market. We employed the Hurst exponent in a sample covering the period from 1 January 2016 to 26 March 2021. We calculated the Hurst exponent in three non-overlapping consecutive windows and in the whole sample. Using...

An immediate consequence of the Efficient Market Hypothesis (EMH) is the absence of auto-correlation of the return series of the financial prices and the exclusion of excess profitability made by any (active) trading strategy. However, the precondition for the validity of EMH, which assumes that...

The main purpose of this article is to prove that prices of selected metals quoted at London Metal Exchange could be described as biased random walks. In this paper hypothesis of black noise character of returns is verified (sequences are observed more frequently than reversals). Exploiting...