The ICSID Award in the case of Occidental v Ecuador in its international, municipal, cultural, philosophical, and psychological contexts. The sensitivity of host States and their citizens in foreign direct investment, expropriation, and dispute resolution cases. The roles of proportionality, contributory error, and discretion in investor-State arbitration. A critique of the process for appointing ICSID arbitrators in light of potential psychological issues relating to hidden biases and cultural intelligence. The transmission to Home State investors of Home State’s rights against the Host State and some conflict of laws issues in hybrid investor-State arbitration. The Calvo Doctrine and the sensitivity of Latin American States in regard to investor-State arbitration proceedings and decisions on the merits. Denunciation of ICSID by some Latin American States, their move to UNASUR instead, and a discussion of whether such move allows host States to avoid international law and the professional duties of investor-State arbitrators. The potential role of psychologists in investor-State arbitration at the institutional and professional levels.