Taleb's first book was published about 20 years ago and is still selling.

True: Taleb's first published book (expected to be Dynamic Hedging, Wiley) was published about 20 years before April 2018, that is between roughly 1996 and 2000, and was still in print or on sale new in 2018. Mostly true: the book was still selling, but the publication date is a few years outside that window (roughly 1994–1995 or 2001–2002). Mixed: one part holds and the other clearly fails. Mostly false: the book was published about 20 years earlier but was out of print or no longer on sale in 2018. False: his first book was published far from 20 years earlier and was not still selling.

Set before the research began.

1. E1 Dynamic hedging : managing vanilla and exotic options : Taleb, Nassim Nicholas, 1960- : Free Download, Borrow, and Streaming : Internet Archive Internet Archive (catalogue record built from library MARC data, including OCLC and LCCN identifiers) · 1 April 2022

   “Publication date - 1997 - Topics”

2. E2 Dynamic hedging : managing vanilla and exotic options Stanford University Libraries (SearchWorks catalogue record)

   “noted option arbitrageur Nassim Taleb uniquely covers both on-model and off-model derivatives risks.”

3. E3 Dynamic Hedging Managing Vanilla and Exotic Options eCampus (bookseller listing) · 14 January 1997

   “PART I MARKETS, INSTRUMENTS, PEOPLE”

The Internet Archive library catalogue record [E1] gives 1997 as the publication date of Taleb's Dynamic Hedging, about 21 years before April 2018, so the date part of the claim holds. No item shows the book was in print or on sale new in 2018. The eCampus listing [E3] is dated 1997, and its quote is only a table-of-contents heading. The Stanford record [E2] gives no date or availability information. Since the evidence does not settle the 'still selling' part, the claim cannot be resolved under the criteria.