A tag is a keyword or label that categorizes your question with other, similar questions. Using the right tags makes it easier for others to find and answer your question.

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A routine question from a textbook, course, or test used for a class or self-study. This community's policy is to "provide helpful hints" for self-study questions.
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For questions *about* being a quant, akin to questions on programmers.SE vs. SO. Includes soft questions, career-related questions, questions about best practices, etc.
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Questions about Interactive Brokers, a retail brokerage, and its API for automated trading.
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easy to define qualitatively (the easiness to buy or sell an asset), but difficult to measure.
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A debt security that doesn't pay interest (a coupon) but is traded at a deep discount, rendering profit at maturity when the bond is redeemed for its full face value.
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forecast the prices direction based on the past market data study.