Merge pull request #226 from bitshares/bsip77

BSIP77: Require Higher CR When Creating/Adjusting Debt Positions

README.md

@@ -82,7 +82,7 @@ Number             | Title                                                    |
 [74](bsip-0074.md) | Margin Call Fee Ratio | Jerry Liu | Protocol | Draft
 [75](https://github.com/bitshares/bsips/issues/96) | Asset Owner Defines MCR and MSSR Values | John Jones | Protocol | Draft
 [76](https://github.com/bitshares/bsips/issues/221) | Committee-Defined SmartAsset Collateral Threshold | Abit More | Informational | Draft
-[77](https://github.com/bitshares/bsips/issues/161) | Require Higher CR When Creating/Adjusting Debt Positions | Abit More | Protocol | Draft
+[77](https://github.com/bitshares/bsips/issues/161) | Require Higher CR When Creating / Adjusting Debt Positions | Abit More | Protocol | Accepted
 [81](https://github.com/bitshares/bsips/issues/229) | Simple Maker-Taker Market Fees | Abit More | Protocol | Draft
 [84](https://github.com/bitshares/bsips/issues/81) | Elections Based on non-Core Asset | Peter Conrad | Protocol | Draft
 [85](https://github.com/bitshares/bsips/issues/240) | Maker Order Creation Fee Discount | Abit More | Protocol | Draft

bsip-0077.md

@@ -0,0 +1,74 @@
+    BSIP: 0077
+    Title: Require Higher CR When Creating / Adjusting Debt Positions
+    Authors: Abit More
+             @shulthz
+    Status: Accept
+    Type: Protocol
+    Created: 2019-09-30
+
+# Abstract
+
+This BSIP proposes a protocol change which aims to improve overall collaretal ratio (CR) of smartcoins.
+
+# Motivation
+
+Risk-loving traders tend to borrow as much debt as possible with as little collateral as possible,
+which impacts overall CR of that smartcoin. Smartcoin owners would like to have a tool to counter
+this behavior.
+
+# Rationale
+
+Requiring a higher CR for new debt positions would introduce a buffer thus would increase the
+stability of the smartcoin.
+
+# Specification
+
+Add one parameter "Initial Collateral Ratio" (ICR) to each smartcoin asset, which can be updated by the asset owner.
+
+When adjusting a position, apply [BSIP30](https://github.com/bitshares/bsips/blob/master/bsip-0030.md)
+if current CR is lower than ICR but not MCR.
+
+Before the protocol upgrade:
+```
+when creating a new debt position
+  require CR > MCR
+
+when adjusting a debt position
+  if new CR <= MCR
+    require CR increased and debt not increased
+
+when current CR <= MCR
+  trigger margin call
+```
+
+After the protocol upgrade:
+```
+Require ICR >= MCR
+
+when creating a new debt position
+  require CR > ICR
+
+when adjusting a debt position
+  if new CR <= ICR
+    require CR increased and debt not increased
+
+when current CR <= MCR
+  trigger margin call
+```
+
+Note: logic around *target collateral ratio* (TCR) is not affected.
+
+# Discussion
+
+This BSIP introduces a new tool for smartcoin asset owners to fine tune their assets.
+Having an ICR greater than MCR would probably result in less risk-loving traders borrowing that
+smartcoin, thus may lead to fewer market activities and worse liquidity. It's up to the asset owners
+to decide whether to use this tool.
+
+# References
+* https://github.com/bitshares/bsips/issues/129#issuecomment-483937118
+* https://github.com/bitshares/bsips/issues/96#issuecomment-484126930
+* https://bitsharestalk.org/index.php?topic=29638.0
+
+# Copyright
+This document is placed in the public domain.