THETA stock

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Theta is a metric that looks at the decay of an option's price over a one day period, all else equal. As premium sellers, theta is always on our side at tastytrade.

http://www.optionalpha.com - Option traders need to learn how Theta - Time Decay Of Options - works before you can start making serious trades. I'll show you ...

https://en.wikipedia.org/wiki/Theta_Phi_Alpha

https://en.wikipedia.org/wiki/Theta_function