Final answer:
This question pertains to the field of Psychology and discusses the relationship between euphoria, gratitude, and happiness.
Step-by-step explanation:
The subject of this question falls under the field of Psychology. It relates to the concepts of happiness, euphoria, and gratitude. The question explores the possibility of experiencing constant euphoria and the role of gratitude in finding happiness. It discusses the limitations of measuring happiness and acknowledges the different types of pleasure that can contribute to overall well-being.