Who is Butler in Marx' footnote in Das Kapital? In footnote [7] of Marx's Capital, T.I, Ch. 1, Sec 1, after ...contradictio in adjecto, there are these quotes: «Nothing can have an intrinsick value.» (N. Barbon, t. c., p. 6); or as Butler says - «The value of a thing is just as much as it will bring.». 

Does somebody knows who is this Butler and where is that quote?
I googled "The value of a thing is just as much as it will bring." in quotes, and got several hits that show Marx referred to Samuel Butler, the author of Hudibras.

Here is one.

Here is a another, see Inscription.