不可能三角

graph LR
  A(((exchange freedom)))
	B(((controlled interest)))
	C(((stable exchange rate)))
	A -..- B -..- C --- A

PIVOT双币模型

graph TB
	su[/sBABEL goes up while gBABEL low/]
	suu[/sBABEL goes up while gBABEL high/]
	sd[\\sBABEL goes down a lot\\]
	gl ==>|sBABEL demand increase| su
	sd ==>|collateral goes down| gd
	gh ==>|sBABEL demand increase| suu
	su ==>|"collateral (sBABEL) goes up"| gu
%%--------------------------
	subgraph stable protocol
		gh((gBABEL  high))
		gd[\\gBABEL goes down\\]
		gu[/gBABEL goes up/]
		gl((gBABEL  low))
		gh -.->|gPIVOT supply increase| gd
		gd -.-> gl
		gl-.->|"collateral (sPIVOT) amount increase"| gu
		gu -.-> gh
	end

与Luna对比

PIVOT Terra Luna
股权币 sBABEL LUNA
gas币 gBABEL UST
承诺固定利率 否 是
利息奖励给 股权币质押者 gas币质押者 
graph TB

	subgraph Ponzi miracle	
		su[/LUNA goes up/]
	end
%%--------------------------
	subgraph stable protocol
		gh((UST  high))
		gd[\\UST goes down\\]
		gu[/UST goes up/]
		gl((UST  low))
		gh -.->|UST supply increase| gd
		gd --> gl
		gl -.->|UST supply decrease| gu
		gu --> gh
	end
%%--------------------------
	subgraph death spiral
		sd[\\LUNA goes down\\]
		
	end
		gl ===>|LUNA supply increase| sd
		sd ===>|decrease the reserve to coin interest| gd
		gh ===>|LUNA supply decrease| su
		su ===>|increase the reserve to coin interest| gu 

		%%risk([increase arbitrage risk])
		%%sd --> risk
		%%su --> risk

LUNA不稳定的抽象示意图。

LUNA不稳定的抽象示意图。