Margin levels are set by exchange as a function of price volatility; in the case, of bitcoin, the margins are very high. Upon entering the long/short position, the position must be funded by the INITIAL margin (e.g., e.g., 43% of contract notional for bitcoin, but typical is less than 10%). If the margin account balance drops below the MAINTENANCE margin, a MARGIN call is triggered: in which case, the account must be funded back ("topped up") to the INITIAL margin level. If the balance exceeds the initial, then excess may be withdrawn.
David's XLS is here: https://www.dropbox.com/s/95y7tf7gqmujlsw/0101-bitcoin-margin.xlsx?st=4utzqlex&dl=0
David's XLS is here: https://www.dropbox.com/s/95y7tf7gqmujlsw/0101-bitcoin-margin.xlsx?st=4utzqlex&dl=0
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