Friedman as Logician (ii)

Faust's pact with Mephisto,
engraving by Julius Nisle, circa 1840. [A]

The previous post argued that Friedman's methodology allows unsound arguments.

Fine. So what?

That post provides material sufficient for an answer. As it happens, the answer turns out to be delightfully topical: unsound arguments are a Faustian bargain.

Friedman as Logician (i)

"Few persons care to study logic, because everybody conceives himself to be proficient enough in the art of reasoning already. But I observe that this satisfaction is limited to one's own ratiocination, and does not extend to that of other men". Charles S. Peirce.

"You seem a little confused. You [sic] first statement ‘all dogs are mammals' is indeed circular". Phil Stein.

If the proposition "good reasoning is unimportant" were a human being, it would surely be an extremely unpopular and sad character: few would like to be seen in her company. In particular, economists and econo-aficionados of all stripes glory themselves in their assumed, but frequently unproven, logical thinking.

Friedman's Methodology: Maximally Questionable.

The expression below shall prove useful, even if we avoid the maths. So, be brave:

        Max p*q(K, L) – w*L – r*K
       K, L
(1)     K >= 0
        L >= 0

Firms and households/consumers are the two fundamental economic agents: microeconomics begins with their study. Expression (1) is the firm's most basic representation: it shows its profit maximisation problem in the long run and embodies a number of different assumptions (see Appendix 1, for details). Even if readers find that expression otherwise cryptic, at least the "Max" should indicate "maximisation", while p*q - w*L - r*K is profits: revenue (price times quantity) minus costs (wage bill: wages times manhours; and capital costs: percent return times capital).