What I got from this is that arbitrage between the cost of input resources for producing something of value, and the revenue of the output is a key driving force in an economy (not simply corrections of minor imperfections tending towards a perfect equilibrium, as Weinstein apparently wants to believe for Gauge Theory). The economy can never be mathematized when its variables comprise a myriad of conscious beings with subjective intent, and far less so in an environment where the would-be yardstick ($) is itself floating in an unpredictable sea of the futile ambitions of a tiny subset of those conscious beings with their own subjective intent (Fed)