Esotericism, properly, is the study of transmitted and secret knowledge of any kind. While the knowledge is generally philosophical or ethical and mystic, it can, in theory, be of any kind.
Many groups or schools of thought embrace an esoteric tradition or philosophy:
... a household in the town is $72,500, and the median income for a family is $89,211. Males have a median income of $51,172 versus $32,500 for females. The per capita income ...