Duke of Marmalade
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Hi Duke
Even if funding was not a problem for you, how much would you pay AIB to buy my €100,000 ECB + 1% repayment mortgage with 20 years left on it?
Let's assume it has a low loan to value and good credit.
Let's strengthen the assumptions completely:
1) You are AAA and can borrow at Euribor. Short term Euribor is about 50bp above ECB which reflects that even AAA banks have some credit risk.
2. The punter is 100% creditworthy so that one can definitely expect to get paid ECB + 100bp.
On these idealised assumptions, and allowing some margin for administration, the mortgage is worth its full face value. The only issue is that the terms are guaranteed so the AAA bank can't be sure that it will always be able to borrow at Euribor.
Remember when these Trackers were sold it was not thought to be madness. The banks thought they could get Euribor funding forever and they thought the collateral security was bomb proof. For current AAA banks and for low LTVs these assumptions are still broadly true. This highlights the difficulty in coming up with a one size fits all formula.