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In short: A difference between relevant prices, such as buy and sell prices or a quote and a chosen reference.
A difference between relevant prices, such as buy and sell prices or a quote and a chosen reference. State the comparison basis; it is not always a separately billed fee. A comparison requires a stated reference price, time and trade size. A difference from a market reference can reflect several factors and should not automatically be labeled a hidden charge. Compare the usable net output as well as separately disclosed fees.