Economics are my favorite subject. Economics is my favorite subject. In Chapter 31 we discussed consistent pronoun usage and reference. When we address another person directly , as in letter writing, our words are intended for one specific person to read or hear. This is the second person.
Third person is used in all other cases, both formal and informal.
When our words are intended for anyone's ears, such as when delivering a public speech or writing an academic essay, we cannot limit our address to just ourselves or one trusted friend. Assume that every academic essay should be intended for a larger audience to read and respond. Since our audience is literally everybody, we cannot lock ourselves into the limiting forms of pronouns, such as the 1st and 2nd person. Assume that every essay needs to be written in the third person perspective. Therefore, proofread your essays carefully to eliminate your references to yourself or to some unnamed second person.