LAST month Schumpeter attended an event at the New York Stock Exchange held in honour of Brian Chesky, the co-founder of Airbnb, a room-sharing website that private investors value at $31bn. Glittering tables were laid out not far from where George Washington was inaugurated in 1789. The well-heeled members of the Economic Club of New York watched as Thomas Farley, the NYSE’s president, hailed Airbnb as an exemplar of American enterprise.