Sharing is popular again. It’s been 25 years since Harry Enfield mocked 1980s greed and individualism as his Loadsamoney character – a cockney plasterer. Now, a quick and exciting route to riches is promised by the sharing economy. Airbnb, its posterchild, is worth $2.5bn (£1.5bn) and Silicon Valley is buzzing again. Does sharing represent a scalable opportunity for a socially productive economy? This blog grounds the sharing economy in some context, and is followed by Part 2, analysing of who profits from sharing.