Two years ago at Davos, the sharing economy was a foreign concept.Whenever I asked anyone I met if they had heard of the phrase, I would receive blank stares. Perhaps 5% of people had heard of Airbnb (though they rarely used it). Quite a few more had heard of Zipcar ' maybe around 20% of the people I spoke to ' but most of them admitted that their familiarity was due to the company's acquisition by Avis earlier that month.The year 2015 was when the sharing economy arrived, full force, in Davos. The majority of people I spoke to were familiar with the term, and many had even used sharing economy services. Moreover, the discussions about sharing as 'disruptive innovation' focused on the potential positive benefits.That doesn't meant to say they ignored the challenges and unknowns, but most people recognized that these new business models are here to stay. Far from being afraid of these services and the changes they would bring, most people were accepting of them. In fact, many were curious to know how to participate in, rather than ban, these new platforms and services.The sharing economy also provided an ideal lens to explore and contribute to other key Davos themes: trust, the circular economy, urbanization, and global development.TrustOn the first day, Professor Klaus Schwab, the founder and executive chairman of the World Economic Forum, said that trust wasthedefining issue for the Annual Meeting. Around the world, business and government are suffering from massive trust deficits. However, the emphasis was always on traditional approaches to trust. New notions of trust ' and new models of building it, such as platforms likeTraityand peer reviews ' were rarely featured in sessions. The sharing economy is full of these models and meaningful insights. Looking ahead, what could the Forum community learn from them'The circular economyThe Circular Economy Awardwas one of the most talked-about events of Davos, celebrating pioneers in sustainability and zero waste. Several nominees came from the sharing economy, includingLyft,SpareToShareandParkFlyRent. The nexus between the circular and sharing economies is increasingly robust. In the future, we should expect to see more overlaps and collaboration (zero-waste products designed specifically to be shared, anyone').UrbanizationThe sharing economy presents significant opportunities for cities: from resource efficiency to local economic investment, community connectedness and resilience. It naturally harnesses hyper-local and citizen-led innovation. Although there were many rich discussions about its role for the future of urban development, it is essential to involve more mayors (and other visionary local leaders) in Davos to reach its full potential. To do otherwise leaves value on the table, for business, policy-makers and residents alike.Global development and Sustainable Development GoalsDavos this year presented an unprecedented opportunity and venue to bridge trends in the sharing economy with global development issues. A range of insights surfaced, from how peer-to-peer networks could help measure and meet Sustainable Development Goals, to addressing sustainable consumption vis--vis the emerging middle class, to the significant (yet largely untapped) role for impact investors. It was incredibly exciting to see ' for the first time ' the CEOs of large companies, non-profits, consultancies and think tanks finally start to have these conversations.'Purpose-driven business' was one of the most commonly heard phrases at Davos. We should keep in mind that many sharing economy companies and platforms have social purpose built into their DNA: they existbecause ofcommunity, and they thrivebecause ofsocial impact.Join the conversation about this storyNOW WATCH: Research Reveals Why Men Cheat, And It's Not What You Think Click here to read full news..