This is a set of "The Black Swan: The Impact of the Highly Improbable" (上下 - upper and lower volumes). The upper volume has only a few pages read, while the lower volume is unused. Purchased a month ago and stored at home, so please only purchase if you understand this! #Mamoru Mochizuki #Mamoru_Mochizuki #Nassim Nicholas Taleb #book #society/economy & finance