Lorenzo Cantoni of the Università della Svizzera Italiana for hosting me during 2019, which has contributed to the enrichment of this thesis.I would like to thank as well Dr. Mariangela Lavanga of the University Erasmus of Rotterdam for welcoming me in 2020 and having made the most out of the unprecedented circumstances and continue collaborating together. I would like to extend my sincere thanks to the Fundación Banco Sabadell for their kind contribution towards this thesis and my stay abroad with a generous fellowship.My appreciation also goes out to my family and friends for their encouragement and support throughout my studies. Especially, the warmest thank you to my mum and my husband, Alessio, not only for their moral support and comfort but also for the technical assistance for the analysis of this thesis.Lastly, and most importantly, thanks to God, since this thesis has been inspired by the love of God, to honor the Creation, and supported all the way by the love of God.