[Haskell-beginners] Question in "Monads for Functional Programming"

Hi all, I am referring to P. Wadler, "Monads for functional programming," Advanced Functional Programming, pp. 24-52, 1995. I cannot understand in chapter 2.6, why a*k = k a. I cannot ask anyone else this time of night (3am here J), thus I posted here! Best regards! -- Aggelos Mpimpoudis Doctoral Researcher, Pervasive Computing [p-comp.di.uoa.gr] SDE, Nessos IT S.A. [www.nessos.gr] (m): +306942075153 http://gr.linkedin.com/in/aggelosmp Description: Linkedin http://www.facebook.com/aggelosmp Description: Facebook http://www.studentguru.gr/blogs/grnemo/ Description: Blog RSS http://twitter.com/aggelosmp Description: Twitter