Taleb defined it very simply as any high impact surprise event. Of course, the definition of surprise is relative to the observer. To the lunatics at the NYT who push bilge about continuing American primacy, a meteoric decline in America’s standing (probably emerging from some of the fragilities I have identified in the global economic fabric) would be a black swan. It would also be a black swan to the sorry swathes of individuals who believe what they hear in the mainstream media, and from the lips of politicians (both Romney and Obama have recently paid lip service to the idea that America is far from decline). Such an event would not really be a black swan to me; I believe America and her allies will at best be a solid second in the global pecking order — behind the ASEAN group — by 2025, simply because ASEAN make a giant swathe of what we consume (and not vice verse), and producers have a historical tendency to assert authority over consumers.