The sharing economy is a relatively new trend that occurs practically all over the world. It involves a complete change of organizational and distribution models. The main structure focuses on a distributed network of people and communities. This includes mutual service provision, sharing. This is definitely to use resources more efficiently. In recent years, we have seen a great popularity of systems based on the idea of the sharing economy. Crowdsourcing is a process related to the sharing economy in terms of obtaining information/knowledge. It is a process in which a given organization, a public entity, or a company performs outsourcing of tasks. The inquiry is usually directed to an unidentified, usually very wide group of people in the form of an open call. In the article, the author wonders if the sharing economy is the new economy? What is the impact of the sharing economy on Smart City? Is Crowdsourcing part of the sharing economy or is it the reverse? Will the sharing economy and crowdsourcing be the future of Smart City and what motivates residents to share together? There is a correlation between the development of the idea of the sharing economy and crowdsourcing and the development of Smart City. The article analyzes the relationship between these two trends and their impact on Smart City. The verification is carried out on the example of the city-state of Singapore, which has been occupying leading places in the Smart City rankings in recent years. An interesting aspect discussed in the article is also the exchange of knowledge in Smart City and the cycle of information between residents, decision-makers, and stakeholders and third parties, such as education or business.