SOCIAL INFORMATION SYSTEMS ENGINEERING: FROM DATA TO KNOWLEDGE NETWORKS

The Information System representation is moving in a conflicting direction with organisations evolution, which have to be more accessible and transparent for the external environment in order to be able to anticipate on the market moves and trends. The existing separated layers between internal users and end products or services users are harmful to the normal business process continuity. With the increasing use of web 2.0 tools and platforms, the complete Information system analysis and design approach has to be rethink in order the include this new fundamental subpart inside of it. Several approaches and disciplines are attempting to resolve this issue varying from the services approach (starting from SOA and ending by the services science) to the knowledge pattern approach (based mainly on Information systems cartography). The social knowledge pattern (SKP) is a set of common behaviour realised by a networked community and based on the knowledge that they are sharing. The SKP are useful for detecting global users trends, formalising the knowledge exchange and to define the existing interactions between the different system users. This paper considers the problem of the knowledge integration through the SKP based on services approach

Shelter in Uncertainty: Evaluating Gold and Bitcoin as Safe Havens Against G7 Stock Market Indices During Global Crises

This paper investigates the hedging and safe haven capacity of gold and Bitcoin against the G7 stock market indices during the COVID-19 pandemic, the Russia-Ukraine military conflict, and the Silicon Valley Bank collapse. Using a novel Quantile-VAR connectedness approach, the results show that, at the median quantile, both gold and Bitcoin act as effective hedges during normal market conditions and strong safe-haven assets during the three crises. Gold emerges as the most prominent safe haven asset, outperforming Bitcoin, especially during the war and the SVB collapse. Among the G7 stock market indices, the Japanese and the American stocks may be used as risk diversifiers during crises. As for the rest of the G7 stocks, they are regarded as “risk-on” investments.  Next, we assessed the robustness of our results at various quantiles. We found them to be generally consistent with the outcomes obtained at the median quantile, with one exception related to the S&P500.The results show that the repercussions of the COVID-19 pandemic and the war are much stronger than the American banking crisis

Can cryptocurrencies be a safe haven during the novel COVID-19 pandemic? Evidence from the Tunisian Stock Market

In this paper, we discuss the behavior of stock market returns in Tunisia during the COVID-19 outbreak. Using the OLS regression, we find that Bitcoin act as a hedge and Ethereum as a diversifier for Tunisia’s stock market before the COVID-19 outbreak; however, Bitcoin and Ethereum cannot generate benefits from portfolio diversification and hedging strategies for financial investors during the COVID-19. Moreover, Dash, Monero, and Ripple act as hedges before the COVID-19 outbreak and as diversifiers during this pandemic. Our results reveal that gold acts as a hedge and diversifier before the pandemic, but it's neither hedge nor a haven during the COVID-19 pandemic. Besides, the results indicated that the expected volatility of the US stock market has an impact on the Tunisian stock market. Finally, our results indicate that the growth rate of the COVID-19 confirmed cases and deaths harms Tunisia's stock market

Règlementation des mouvements des capitaux et autonomie monétaire : Évidence empirique des pays émergents et en développement

Cet article analyse l'impact des règlementations des mouvements des capitaux sur l'autonomie monétaire en utilisant l'analyse de données de panel pour 62 pays émergents et en développement sur la période 1995-2017. Les résultats empiriques montrent qu'une plus grande ouverture du compte de capital, un régime de change fixe ainsi qu'un niveau élevé d'intégration financière et d'inflation peuvent réduire l'indépendance de la politique monétaire dans ces pays. Il semble donc que le contrôle des capitaux puisse être efficace pour promouvoir une certaine autonomie de la politique monétaire dans une petite économie ouverte. Nous montrons que ces résultats sont robustes à des changements importants au niveau de l’échantillon de pays et de la structure du modèle

Exploring Services Science4th International Conference, IESS 2013, Porto, Portugal, February 7-8, 2013. Proceedings /

XII, 343 p. 76 illus.online resource

Can gold-backed cryptocurrencies have dynamic hedging and safe-haven abilities against DeFi and NFT assets?

Given that the interconnections of NFT and DeFi digital assets with other stablecoins still not sufficiently studied, this paper is two-fold. We first examine the dynamic conditional correlation between gold-backed cryptocurrencies and NFTs and DeFi assets during the period 02/11/2021-05/01/2023. We thereafter assess the diversification potential of gold-backed cryptocurrencies against NFTand DeFi. To this end, we use the time-varying Student's copula to investigate the cross-markets linkages among different assets in dynamic fashion. We afterwards compute the optimal hedging ratios and effectiveness index to better explore the effectiveness of portfolio risk management. Our findings clearly show that the degree of dependence between gold-backed cryptocurrencies and NFT and DeFi tokens tends to vary over time. Our results also display that gold-backed cryptocurrencies act as suitable hedging (or diversifying) assets during normal times. Nevertheless, such assets can be considered as robust safe havens during the 2022 bear market for the most of NFT and DeFi assets. More specifically, PAXG and PMGT are found to be the best safe haven instruments for both NFT and DeFi tokens. DGX also serves as safe-haven assets for some NFT and DeFi assets, but with a lower risk-mitigation capacity compared to PAXG and PMGT. In most cases, DGX tends to act as a strong diversifier. Its hedging feature is only recorded for the NFT Protocol (xNFT) and the DeFi token Chainlink (LINK). Our results are of particular interest to investors and portfolio managers who search for safe havens to mitigate the risk of their NFT and DeFi portfolios