There is a probability that the transaction goes wrong. Indeed, it is not all transactions that can generate a profit. It is then out at a given time with a loss. The customer, if he has not used the STOP command, is seen in some cases unable to leave his position at a profit. There are agents that impose automatic output to the positions held by customers. It is the insurance agent so they do not find themselves in a position of debt (bankruptcy).
Suppose an automatic output is 25% of the amount invested in any transaction. So if we know the probability that a transaction is coming to an automatic exit, and may have insurance costs.
Formula: Insurance costs ($) = p * amount * (1 - Output (%)).
Example: Assume a probability of 0.001 that the EUR / USD transaction goes wrong.
Insurance costs ($) = 0,001 * $ 1000 * (1 - 0.25) = (0.75 USD).
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forex