"The dissertation focuses on emerging alternative economic networks within a city in crisis, trying to identify their particular socio-economic and techno-economic characteristics, evaluate their socioeconomic viability and compose a broader strategy in managing their expansion. The dissertation establishes the study area within the broader frame of ‘sharing cities’, referring to urban strategies that support the development of socioeconomic networks supported by the use of ICTs as means of enhancing local resilience, social cohesion and boost economic revitalization. The focus is made around three existing initiatives within the city of Thessaloniki, Greece – two Time-banks and a local community currency network that operate through digital platforms. Following qualitative research methods, the dissertation’s purpose is to outline weaknesses and potentials of various models to promote cooperative action within the city, enhance horizontal wealth distribution and community self-management, while providing a fertile ground for further research around sharing cities and alternative economic models as strategies towards combating poverty, enhancing social capital and creating resilient local networks within the cities.