Tranche

Tranche (pronounced trahnch, trahnsh, or trahnsh (French))

(1) One part or division of a larger unit; a slice, section or portion.

(2) A group of securities that share a certain characteristic and form part of a larger offering.

(3) Any part, division, or instalment.

(4) In finance, to divide into parts, applied especially to loans and share issues.

(5) In insurance, a distinct subdivision of a single policyholder's benefits, typically relating to separate premium increments.

(6) In pensions, a scheme's or scheme member's benefits relating to distinct accrual periods with different rules.

1400s: From the French tranche, (a cutting (literally, “a slice”)), a form of trancher (to cut, to slice), from Old French trenchier, trancher & trancher (cut, make a cut), possibly from the Vulgar Latin trinicāre (cut in three parts). It was cognate with the English trench.  The specific uses in economics and finance didn’t emerge until 1930.  The form in Modern French is tranché (feminine tranchée, masculine plural tranchés, feminine plural tranchées), the past participle of trancher (clear-cut, marked, bold, distinct (and in heraldry: per bend)).  Tranche is a noun & verb and tranched & tranching are verbs; the noun plural is tranches.

Tranches in a collateralised debt structure.

Tranche has become so associated with matters financial that the word is now seldom used in other contexts, probably a good thing given it’s likely only to confuse.  In finance, a tranche is a portion of a security (loans, mortgages, stocks, bonds etc) that can be packaged for sale to investors; Securities are broken to be reassembled in different forms for a number of reasons, the most obvious of which is to make them easier to sell.  Because investors base their decision to purchase on factors such as risk, time and the quality of asset backing, tranches prepared for sale vary in the emphasis placed on these factors to attract buyers with different priorities.

Slicing the cake.

Since the global financial crisis (GFC) began in 2008, the perception probably is that packaging is most associated with residential mortgages, the money banks and others loan to people to buy houses as homes or investments.  That’s not entirely true but it has been a big part of the market.  Typically, mortgages are repaid over fifteen to thirty years but the lenders prefer to churn, banks, rather than waiting decades to get the money, on-sell mortgages to investors, thereby gaining the funds to lend for more mortgages.  Because of the limited number of number of investors, individuals and institutional, willing to buy thirty year mortgages, banks create tranches, some including the first three years of each mortgage, some the five years while a few will run for the whole term.

This spread of products appeals to a spread-out market.  Some investors will prefer the low-risk tranche of three-year mortgages and accept the lower interest rate while others will opt for the riskier long-term tranche, attracted by the higher rate.  Tranching is thus a device which maintains the liquidity of the loan pool and provides a differentiated securities market in which investors can adjust their exposure according to their own risk versus reward calculation.

Pick your tranche; you pay your money, you take your choice.

The particular, celebrated case of the sub-prime mortgage crisis which began to manifest in 2008-2009 involved mostly tranches of CMOs (collateralized mortgage obligations) and the problems then were not a product of the structural design of tranching but the quality of what was being tranched.  Essentially, like many of the periodic crises in capitalism, the GFC was triggered by over-production.  The traditional mortgage market consisted of borrowers judged to be capable of repaying the loan but, various things having combined to mean the lenders had run out of them, they resorted to lending to people who would never be able to repay.  That required some clever contractual engineering to ensure (1) the credit-rating agencies would grant investment-grade ratings to what were junk securities so (2) the risk would be quickly on-sold.  The rationale for all of this was that the tranching was done in such a way that the spread of the risk was so diversified that whatever defaults occurred would present no systemic threat.  There are interesting stories about (1) & (2).

Lots lost lots in the GFC but there were also quite a number who made much and very quickly.  So profitable for those few in the right place at the right time was the loaning of money to those with no capacity to repay that it’s hard to believe it won’t, at scale, happen again and there are suggestions it may be happening now.  The unusual combination of borrowing at historically high multiples against static or falling incomes for assets at historically high valuations has happened in an era of historically low interest rates.  Movements downwards in asset values or upwards in interest rates will have a multiplier effect on each-other and those movements, if sufficient, will essentially render much mortgage debt functionally sub-prime and there were those who predicted the extraordinary increase in the global money-supply playing out this way.

The headline in the French language which in 2016 announced: Lindsay Lohan s'est tranché le doigt en deux (Lindsay Lohan sliced her finger in half).

Actually "sliced her finger in half" was a bit sensationalist (one might even say Anglo-Saxon style click-bait).  In October 2016, during an Aegean cruise, there was a nautical incident, the tip of one of her fingers severed by the boat's anchor chain but details of the circumstances are sketchy.  It may be that upon hearing the captain give the command “weigh anchor”, she decided to help but, lacking any background in admiralty terms and phrases, misunderstood the instruction.  The detached piece of digit was salvaged from the deck and ashore, soon re-attached by micro-surgery.  Digit and the rest of the patient are said to have made full recoveries, something especially significant because it was the ring finger which was “tranched” but, thanks to the surgeon’s skill in fixing the gruesome injury, she managed later to find husband and the finger now displays engagement and wedding rings.  All’s well that ends well.