Analyzing the efficient market hypothesis with asymmetric persistence in cryptocurrencies: Insights from the Fourier non-linear quantile unit root approach

Abstract

We test the efficient market hypothesis (EMH) in Bitcoin (BTC) and Ethereum (ETH) using the further Fourier nonlinear quantile (FNQKS) unit root test by Bahmani-Oskooee et al. (2020). While conventional tests support EMH in the cryptocurrency market, the FNQKS unit root test does not support EMH. Considering non-linearity, Fourier breaks, and non-normal distribution in BTC and ETH exhibit asymmetric persistence. This allows investors to make adjustments to their portfolios in response to both negative and positive shocks.