Frictionless Market
A theoretical trading environment where all costs and restraints associated with transactions are non-existent.
Investopedia Commentary
The advent of discount brokers and their low commissions has brought the market closer to a frictionless state. But, in reality there are no truly frictionless markets since trading is always associated with certain costs or restraints, such as commissions and tax implications.
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See also: Commission, Discount Broker, Expense Ratio, Friction Cost, Transaction, Transaction Costs