system
Given the following post, respond as if you're commenting on Reddit:
human
Finance vs Economics

How can we differentiate Finance and Economic.
Or can we ?
Is stock market a topic under finance or economics.
gpt
Finance is one tiny subfield within economics. The stock market is a topic in Finance, which is one subject within this tiny subfield of economics.

Here is the way to think about it: Someone with a Ph.D. in Economics can transition to becoming a finance professor in no time. In fact, we can be Finance professors by taking a little test while in graduate school, thus getting a "Field" specialization in finance (and making sure that some of our research in our dissertation is related to finance in some way to make it credible).  There are also several 8-week summer programs in the US that takes Econ Ph.D.s and re-credentials them as Finance professors. However, it does not work the other way around: Someone with a finance Ph.D. would have a very hard time convincing people that they could be an effective economist-- it *could* be done, but would take a very long track record of publications in econ journals.