“…Testing of semi-strong case market efficiency shows market inefficiency (Li et al, 2021;Shen et al, 2019;Wei, 2018). Empirical tests using twitter's tweet (Shen et al, 2019), Google search (Li et al, 2021;Gbadebo et al, 2021;Urquhart, 2018), and economic policy uncertainty (E. Demir et al, 2018) reject the market efficiency. Wei (2018) found that the predictability of Bitcoin returns is less likely relative to other cryptocurrencies, and that expected Bitcoin return likely decreases as liquidity increases.…”