ABACUS: selection is part of the information
Documented sequence. ABACUS 2007-AC1 was a synthetic CDO linked to mortgage-security performance. In July 2010, the SEC announced a $550 million settlement with Goldman Sachs concerning misleading disclosure. Goldman acknowledged incomplete marketing information about Paulson & Co.’s role in selecting the reference portfolio and its adverse economic interest. It otherwise settled without admitting or denying the allegations. The announcement was subject to court approval. The case concerns this specific transaction and disclosure, not all mortgage securities.
SEC · Goldman Sachs ABACUS settlement announcement, July 2010
Original analysis: the sample was chosen. A buyer can understand the broad asset category yet lack important information about how the particular exposure was selected. Two portfolios with the same label can have different characteristics. If a participant helping choose the reference assets benefits when those assets perform poorly, the buyer has a reason to scrutinise selection. The issue is not that opposing views exist; opposing views are ordinary in markets. It is whether the process and relevant interests were represented accurately.
A synthetic structure also requires careful language. It references credit outcomes through derivatives rather than simply passing through payments from a collection of newly funded household loans. That distinction matters when discussing who is financing what and how exposures are created. The early mortgage-market development in Lewis’s book and this later structure belong to different periods and arrangements. Treating them as identical would hide the very contractual detail the lesson asks readers to examine.
Hypothetical worked example. Suppose a buyer is offered exposure to twenty companies described as a broad sample of an industry. A participant who profits from defaults helped choose all twenty, focusing on firms with near-term refinancing needs. The buyer might still choose to invest at an appropriate price, but the selection rule is relevant evidence. An industry-wide average default rate would not necessarily describe this selected group. This example is invented and does not assert the actual portfolio composition of ABACUS.
The stock-market connection is curated evidence. A fund presentation may select winning trades; a management deck may select favourable competitors; a research service may select companies likely to support its thesis. Selection need not be improper to affect interpretation. The reader should ask what the full population was, who selected the sample and whether the selection rule was known before the outcome. A correct calculation on a biased sample remains a biased basis for a broader claim.
A common misunderstanding is that a sophisticated investor should never need disclosure. Expertise helps interpret information; it does not reveal an undisclosed process automatically. Another is that a seller having inventory or an opposing view proves a violation. It does not. The specific representations, material information and legal context matter. Our educational comparison concerns the information problem and does not offer a legal conclusion about other transactions.
For a shareholder evaluating a financial firm, distribution revenue should therefore be considered alongside the quality of disclosure and client relationships. A profitable transaction may create later remediation costs or reputational damage if its presentation is defective. Conversely, clear disclosure can allow parties with different objectives to transact knowingly. The goal is not a market in which everyone agrees, but one in which disagreement is not disguised by an inaccurate account of the product.
Takeaway. Ask who built the basket before asking whether the basket’s headline return is attractive. Obtain the selection rule, the relevant economic interests and the limits of the comparison data. Then decide what remains uncertain. Complexity should lead to more precise questions, not a suspension of them.
What information about a selected portfolio cannot be replaced by an attractive yield?
The selection process, adverse interests, asset characteristics and loss-allocation contract remain essential.
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