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Item Connectedness among diverse financial assets: Evidence from cryptocurrency uncertainty indices(Technological Forecasting and Social Change, 2025-01) Batra, Shallu; Tiwari, Aviral Kumar; Yadav, Mahender; Danso, AlbertThis study examines the impact of cryptocurrency uncertainty indices on green bonds, currency, and commodity markets by using weekly data from January 1, 2014, to December 30, 2022. The study analyzes such relationships employing the time-varying robust Granger-Causality test coupled with the TVP-VAR-DY approach. The empirical findings unfold the heterogeneous effects of uncertainty indices toward diverse financial instruments pronounced during financial or economic turbulence. The DY approach indicates that total connectedness among financial assets varies significantly over time. The green bond market is the net receiver, while ishares Global Clean Energy ETF (ICLN) and VanEck Low Carbon Energy ETF (SMOG) indices transmit the shocks for the whole period. The findings suggest that holdings in the green bond market after the health crisis offer greater hedging opportunities to investors. The results have significant ramifications for financing, hedging, and policymaking.Item Investor attention and market activity: evidence from green cryptocurrencies(Studies in Economics and Finance, 2025-04-18) Ahmed, Mohamed Shaker; Helmi, Mohamad Husam; Tiwari, Aviral Kumar; Al-Maadid, AlanoudPurpose This paper aims to investigate the relationship between investor attention and market activity (return, volatility and volume) using a sample of 14 clean energy cryptocurrencies (hereafter green cryptocurrency), namely, Chia, Cardano, Stellar, Tron, Ripple, Nano, IOTA, EOS, Bitcoin Green, Alogrand, Hedara, Polkadot, FLOW and Tezos. Design/methodology/approach This paper use 26040 crypto-day observations and a range of econometric techniques, including Dynamic Granger causality, Panel vector autoregression (VAR), Impulse response function and the decomposition of forecast error variance. Findings Based on 26040 crypto-day observations, this paper finds a bidirectional Granger causal relationship between investor attention and all measures of market activity, namely, return, absolute volatility, squared volatility and volume. The panel VAR and impulse response function demonstrate that market activity in the green crypto ecosystem, especially volatility and volume, is considerably responsive to changes in investor attention proxied by Google search volume (hereafter Google search volume (GSV)). The findings also demonstrate a significant asymmetric effect of return and volume on investor attention since past negative shocks “or bad news” in return and volume are more likely to grab the investor’s attention. All in all, our study emphasizes the crucial role of investor attention in the green crypto ecosystem. Originality/value (i) The research is the first to shed light on investor attention in the green cryptocurrency market. (ii) The paper uses a wide range of green cryptocurrencies to offer a comprehensive picture of the green cryptocurrency ecosystem. (iii) This paper is the first to use the panel Granger causality to investigate investor attention in the cryptocurrency market which provides several advantages over the conventional Granger causality approach. (iv) This paper is the first to provide novel empirical evidence on the prevalent influence of investor attention in the green crypto market.