Please submit your concern

Explanation:

As per the first sentence, economists earlier were unconcerned about psychology while now they want psychology to be used to maximise profits. Thus option 1 can be inferred from the passage. Retain it. Though happiness and GDP are compared in the penultimate paragraph, it is not mentioned to be the work of economists. Thus option 2 can be negated. The fourth paragraph talks about Facebook using our emotions to target the influence of advertising. However, it is not the work of economists but companies. Thus option 3 is also incorrect. This paragraph is targeting only happiness and not emotions in general. Thus option 4 which talks about understanding human behaviour is too general and can be negated.
Hence, the correct answer is option 1.