Assumed frictionless market
In economic theory a frictionless market is a financial market without transaction costs. Friction is a type of market incompleteness. Every complete market is frictionless, but the converse does not hold. In a frictionless market the solvency cone is the halfspace normal to the unique price vector. The Black-Scholes model assumes a frictionless market.
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Startup unicorns 5 frictionless markets build a billion dollar startup almost overnight
References
Frictionless market Wikipedia(Text) CC BY-SA