Add training workflow, datasets, and runbook
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280 • The Intelligent Option Investor
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Clearly, there is not much of a difference between the BSM expected
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value (shown by the dotted line) and the dot representing a 10 percent
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upward drift in the stock. However, if we extend this analysis out for three
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years, look what happens:
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5/18/2012 5/20/2013 249 499
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Date/Day Count
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Advanced Building Corp. (ABC)
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749 999
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20
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30
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40
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50
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60
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70Stock Price
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80
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With the longer time horizon, our assumed stock price is significantly
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higher than what the BSM calculates as its expected price. If we take “assumed
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future stock price” to mean the price at which we think there is an equal chance
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that the true stock price will be above or below that mark, we can see that the
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difference, marked by the double-headed arrow in the preceding diagram, is the
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advantage we have over the option market.
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3 This advantage again means that
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downside exposure will be overvalued and upside exposure will be undervalued.
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How, you may ask, can this discrepancy persist? Shouldn’t someone
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figure out that these options are priced wrong and take advantage of an
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arbitrage opportunity? The two reasons why these types of opportunities
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tend to persist are
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1. Most people active in the option market are trading on a very
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short-term basis. Long-term equity anticipated securities
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(LEAPS)—options with tenors of a year or more—do exist, but
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