Option Volatility - Is an option expensive or cheap ? Implied volatility tries to answer that question.

Trinomial model using VBA code

One way in order to build a ratio backspread strategy is to set it up delta neutral.

Call-Put Parity is specifically set for european style options. What about american style ones ?

There are different ways to price options. Closed forms, numerical and tree models are amongst them. Monte Carlo is another one.

The straddle is a remarkable strategy because it's BiDirectional.