[kevinnk]

I think the more fundamental connection is that when goods are perfect subsitutes for each other, under perfect information you always choose the "cheaper" good (where "cheap" is defined by whatever metric you're using).

Somewhat ironically, this fact actually has connections to the concept of dual variables in constrained optimization problems, the theory of which was largely developed in the Soviet Union for use in central planning.

[the_cat_kittles]

very interesting! that seems to make sense. do you know of any good writing on examples?