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Try it: theta decay
Time is the cost. Watch an option lose it.
Drag the slider from 30 days to expiry down to 0. An at-the-money option is all time value, so you can see exactly what the clock takes.
View data table
Source: Black-Scholes model v1.0, hypothetical inputs. Not investment advice.
30 daysExpiry
- Option value
- 0
- Value vs 30 days
- 0%
- Lost per day now
- 0
Decay is not even. It is slow early and fast at the end, which is why the last week of an option's life moves so quickly.
Results are hypothetical and for illustration only. Not a guarantee. Not investment advice.
Model card
- Name
- Black-Scholes theta decay
- Version
- v1.0
- Purpose
- Show what time costs an option, under stated assumptions, for learning only.
- Method
- Black-Scholes European option, no dividends, constant implied volatility. Spot 25,000, strike 25,000, IV 14%, interest rate 6.5%, call.
- Limitations
- Ignores changes in IV, skew, transaction costs and taxes. Real option prices differ from the model.
- Last reviewed
- 4 Oct 2026
80 lessons. One minute each, one every evening at 7:30.
A Daksh Media series. Daksh Media is the media arm of Daksh Analytics.
How the market is built, how options and data work, how risk works, and how our own heads get in the way. Trader Tales run daily at 5:30 PM, and each ends with one question.
- Format
- 40 to 60 second video with a chart
- Scope
- Generic concepts only. Never a trading method, never a tip.
- Data
- Illustrative charts, or data older than three months
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