Smart city is spreading very quickly around the world with the objective to use both digital and social innovation to transform our cities into socio- and eco- friendly cities, that improve the quality of life, optimize resources consumption and promote social and economic activities. Important researches have already been conducted in the use of digital technology for mart city transformation. However, a successful smart city transformation requires a deep investigation of issues related to the economy and finance of smart cities, such as the economic model, finance mechanisms, economic return of the investment, integration of environmental and social benefits in the economic return and the private and public partnership. In addition, the smart city concept opens large perspectives for innovation in the field of smart finance and smart economy. The objective of this paper is to publish original papers concerning economics and financing in smart cities with a special interest for feed-back from smart city projects or from related issues such as smart buildings, smart water, smart energy and smart transport. This issue is also interested by innovative concepts and frameworks in the field of Smart Finance and Smart Economy.