Re: [請益] 次級房貸
※ 引述《pulover (我出布!我贏了)》之銘言:
: → yuekun:就不是很單純的op (請回想BS對債權的假設) 114.44.191.194 06/12 09:16
: → dos792:我建議y大先去找本教科書看看再說 140.112.50.199 06/12 09:47
: → dos792:lehman倒不是因為做連動債作到倒,是因其 140.112.50.199 06/12 09:49
: → dos792:玩cdo玩到倒。連動債的部門可賺錢的呢 140.112.50.199 06/12 09:50
: → dos792:如果硬要說不獨立,我可以說我每次大便出來 140.112.50.199 06/12 09:52
: → dos792:的溫度跟台股當天漲跌都是非0correlation 140.112.50.199 06/12 09:53
: → dos792:但這有任何義意嗎? 140.112.50.199 06/12 09:54
我是說經濟理論上的獨立 我不想扯太多
: → dos792:我只單純問你cash flow cdo怎麼hedge, 140.112.50.199 06/12 09:55
用CDS hedge 我不是你老師 沒必要回答太詳細 但你可以去看資產證券化的書
當credit event發生時 你的CDO拿不到錢 但是可以從保險公司(AIG)拿到CDS的賠償
(還有 不要再問我 如果這是討論 我沒太多義務回答你)
: → dos792:和一般option(or warrant)的hedge 差在那 140.112.50.199 06/12 09:55
: → dos792:你很快就會發現cdo portfolio本身就賭很大 140.112.50.199 06/12 09:56
基本上投資銀行要發行衍生物 一定是用風險中立評價
Risk Pool則留在保險公司 保險公司有他定價的模式(大數法則之類的)
投資銀行先打兩隻腳 一隻浮動端 一隻固定端 股權衍生物也是一樣 只是比較單純
所以cdo portfolio本身就「賭很大」這句話瑕疵很大
投資銀行一定是賺arbitrage的利差 他不會笨到曝險
1.
如果一檔連動債有包到信用衍生物 在Risk event本來就有直接關聯
2.
如果只是單純的連動債 我個人認為option的假設也不是很完美
尤其連結到Libor去的東西 本來就不是risk-free
再加上保證機構還有倒閉風險 怎麼會說bond端是無風險呢 Lehman不就倒給你看了
既然option的假設有瑕疵 本來就會有一些credit spread滲漏進你組合的東西裡面
相同的股價 (不同的信用風險下) 你的put價格可能會有一些差異 (call也是)
例如A公司的put在金融危機 和 無金融危機
即使BS的參數都相同 但option價格不太相同
BS沒納入信用風險的參數 所以信用風險老早就滲入你的資產組合
ps: 我不清楚Lehman的東西結構到底多複雜 但是倒閉時SPV只剩下1/3的價值
不像是風險中立下會發生的情況
: → washburn:兩位, 別推文了. 回文吧! 118.231.26.217 06/12 11:31
ok!
: 推 yuekun:我本來想推個幾句而已的 沒想到越推越多 114.44.191.194 06/12 11:35
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※ 編輯: yuekun 來自: 114.44.191.194 (06/12 12:30)
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