W hat does it mean to be a "libertarian paternalist" or a "transhumanist"? What is it like to live in an "experience economy"? When people murmur knowingly about something called "the wisdom of crowds", what are they talking about? Is there really a "tipping point" in every field of human endeavour and, if so, where does it come from and how does it work?

Ideas are all the rage. Good ideas have always been contagious, but thanks to the internet and the increasingly globalised media, they are now making their way around the world almost as soon as they are invented. As this new market for ideas begins to settle, something else has become clear too - America is way out in front. If distinctively European thinkers such as Isaiah Berlin and émigrés from Europe to America such as Hannah Arendt had dominated the battleground of ideas during the age of ideology (defined, by the British historian Eric Hobsbawm, as the years between the first world war and the fall of the Berlin Wall), one of the oddities of this new landscape of ideas is that Americans seem to be much better at generating them. There are still some heavyweights around in Europe with novel things to say - Jürgen Habermas in Germany and Slavoj*Zizek in Slovenia, for example - but they are few and far between. When France's Jean Baudrillard died in March last year, at the age of 77, it seemed to signify the close of an intellectual era. In any case, Baudrillard was canny enough to know which way the intellectual wind blew. For all his criticism of American culture, he was enchanted by this place he called "the original version of modernity". France, he pointed out, was nothing more than "a copy with subtitles".