Create baip-0010.md

baip-0010.md

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+BAIP: 0010
+Title:Set Margin Call Fee
+Authors: bitcrab
+Status: Draft
+Type: Consensus 
+Created: 2020-9-1
+```
+### Abstract
+This BAIP propose to set the Margin Call Fee Ratio of the 3 main bitAssets bitCNY, bitUSD, bitEUR based on the implementation of BSIP74 in BTS4.0.
+
+### Motivation
+As described in BSIP74, margin call tradings are potential to contribute a big part of the income to the system, and the fee can be regarded as the cost for stabilization of bitAssets.
+
+### Rational
+This fee ratio will modulate the Maximum Short Squeeze Ratio (MSSR) when determining the Margin Call Order Price (MCOP):
+
+`margin_call_order_price = median_feed_price / (MSSR - MCFR).
+`
+### Specifications
+Set Margin Call Fee Ratio as below:
+
+bitCNY: set MCFR = 1%, MSSR = 1.02
+
+bitUSD: set MCFR = 1%, MSSR = 1.02
+
+bitEUR: set  MCFR = 1% (MSSR is already 1.02)
+
+### Explanation
+While MSSR = 1.01 and MCFR = 1%， `margin_call_order_price = median_feed_price / (MSSR - MCFR) = median_feed_price`, this is not suitable for a margin call order as margin call order price should always be obviously lower than the median feed price, that's why here set the MSSR = 1.02.
+
+To set MCFR to 1% is based on the consideration to "make obvious effect and little pain", surely the value can be adjusted based on the practice in the future.
+
+### Copyright
+This document is placed in the public domain.