Definition BlackScholes Model. Description.
BlackScholes Model is a pricing model of financial instruments,
and in particular stocks and options, derived by Fischer Black and Myron Scholes
in 1973. It is based on arbitrage arguments that uses the stock price, the
exercise price, the riskfree interest rate, the time to expiration, and the
standard deviation (volatility) of the stock return.
The key assumptions of the model are:

The price of the underlying instrument is a geometric Brownian
motion, in particular with constant drift and volatility.

It is possible to short sell the underlying stock.

There are no arbitrage opportunities.

Trading in the stock is continuous.

There are no transaction costs or taxes.

All securities are perfectly divisible (e.g. it is possible
to buy 1/100th of a share).

The riskfree interest rate is constant, and the same for
all maturity dates.

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BlackScholes Option Valuation
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