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Commerce · IV.09 · MMXXVI · daylight
ASSESSMENT · Chapter IV.09 — Design for the Seventh Generation
Three instruments: a ten-point quiz, eight reflection questions, five essay prompts. The quiz checks comprehension rather than recall. The reflections are private and first-person. The essays are arguable from more than one side.
THE QUIZ — ten points
Four on recall.
1. What does the recorded text of the Great Law of Peace, in Arthur C. Parker's 1916 rendering, actually say about future generations — and what does it not say?
It lays on the Confederate Lords a duty to have in view "not only the present but also the coming generations, even those whose faces are yet beneath the surface of the ground — the unborn of the future Nation." One mark for the substance of the clause. One mark for the second half: the number seven does not appear in it. The seven-generation formulation is living Haudenosaunee teaching, stated publicly and influentially by Oren Lyons of the Onondaga Nation from the 1970s, and that is the correct attribution. Credit any answer that also notes the Confederacy is a government rather than a metaphor.
2. Give the Eurocode EN 1990 indicative design working life for (a) buildings and other common structures and (b) monumental buildings, bridges and civil engineering works.
(a) 50 years. (b) 100 years. Credit also for naming AASHTO's 75-year US bridge practice or UK practice at 120 years as the reason "design life" is a jurisdiction-dependent specified quantity and not a physical constant.
3. Write the maintenance endowment formula and state what each term is.
corpus = annual real maintenance cost / real spending rate. The spending rate is a policy parameter set below the portfolio's expected real return, so the principal is preserved. One mark for the expression, one for identifying the spending rate as the thing a board publishes rather than a thing an analyst chooses.
4. Name the two — and only two — honest treatments of a maintenance covenant stated in cash.
Index it, naming the index in the document; or name the year it expires, so that someone has to renew it deliberately. An unindexed covenant with no stated expiry is a covenant with an end date nobody wrote down.
Four on application.
5. A colleague argues that a discount rate "makes us undervalue the future benefits of building things that last." What is missing from that sentence?
The larger half. The rate shrinks the cost of not lasting faster than it shrinks the benefit of lasting, because a replacement is always later than the thing it replaces. At 7 percent, four £40.0m rebuilds at years 40, 80, 120 and 160 have a present value of £2.862m — 1.79 percent of face. Full marks require naming the direction: the rate is not neutral between the two designs, it is actively subsidising the short-lived one.
6. Your organisation uses a 12 percent hurdle rate. The indifference rate between a 40-year and a 200-year design is 4.51 percent. What should you stop doing, and what should you do instead?
Stop arguing the durability case on cost, because it cannot be won at that hurdle and arguing harder produces no new information. Move to the funding structure: an endowment and an indexed covenant, presented in cash and corpus rather than present value. The stronger answer notes that the indifference rate is itself the useful output — it converts a values argument into a question about one parameter, which III.05 shows has a published answer.
7. A property is offered to a charity as a gift, with no money attached. State the charity's position in one sentence, and name the policy that has handled this since 1946.
It is being offered a liability, not an asset. The National Trust's Chorley Formula: a property is accepted only if it arrives with an endowment sufficient to maintain it in perpetuity from its income. Credit any answer that also names US cemetery perpetual care trusts or Norway's fiscal rule as the same move in a different sector.
8. The Elwha and Glines Canyon dams were excellent concrete engineering and had to be removed. What exactly was the design error, and what clause would have prevented it?
Not a structural error. The design life exceeded the confidence interval on the asset's own purpose — the dams outlived the question they answered, and had no fish passage although a Washington State law of 1890 required fishways. The clause: cost, provision and document the removal in the same paper that approves the build. Write the demolition into the birth certificate. Credit any answer noting the realised price: about USD 325 million, USD 11.61m per MW of the 28 MW removed, roughly four times what comparable capacity costs to build.
Two that require the arithmetic to be done.
9. A listed building carries a maintenance obligation of £250,000 a year in real terms, indefinitely. Your board publishes a real spending rate of 3.0 percent. Your corporate hurdle rate is 8 percent. (a) What corpus endows it? (b) What is the present value of the same flow at the hurdle rate? (c) Why do those two numbers differ by the factor they do? Show your working.
(a)
250,000 / 0.030 = £8,333,333. At a 2.5 percent spending rate it would be250,000 / 0.025 = £10,000,000. (b)250,000 / 0.08 = £3,125,000. (c)8,333,333 / 3,125,000 = 2.667, which is exactly0.08 / 0.030 = 2.667. The premium for making a perpetual promise real, over its discounted value, is the hurdle rate divided by the spending rate — and nothing else. Credit any method reaching 2.67. The point of the question is that the gap is not a mystery, a risk margin or a negotiation: it is a ratio of two published numbers, and both of them are decisions somebody made.
10. A flood defence delivers £2,000,000 of avoided damage in year 175 — seven generations, at twenty-five years each. Compute its present value (a) at a flat 3.5 percent and (b) on the Green Book declining schedule (3.5% to year 30, 3.0% to 75, 2.5% to 125, 2.0% to 200). State the multiple.
(a)
2,000,000 / 1.035^175 = £4,858. (b)2,000,000 × 1.035^-30 × 1.03^-45 × 1.025^-50 × 1.02^-50 = £20,368. Difference £15,510; multiple 4.19×. The stronger answer states the conclusion in the right register: the four-fold difference is available free, from a table HM Treasury publishes, and requires a policy amendment rather than a belief. Credit also for computing the half-weight rate —ln 2 / 175 = 0.396 percent a year— and observing that above four tenths of one percent the seventh generation is already worth less than half of one of us.
REFLECTION — eight questions, for one person and a pen
These are not for a room. Write the answers by hand if you can; the slowness is the point.
- What is the longest-lived thing you have ever had a hand in making or choosing? Who will still be dealing with it when you are not, and did you ever picture them?
- Something you use regularly was built by a person who knew they would never meet you. Name it. What did they do that you can feel?
- Where in your own life are you paying the cheap-boiler cost — replacing the same thing repeatedly because the durable version never cleared a threshold you set yourself? What is the threshold actually made of?
- What have you been maintaining faithfully that nobody has ever funded, thanked you for, or written down? What happens to it when you stop?
- You have almost certainly repeated a quotation you never checked. Which one? What would it cost you to go and find its source — and what stops you?
- Think of a commitment you made that later turned out to foreclose something better. What would you have had to have known, and could you have known it?
- If you could leave four things to whoever replaces you — drawings, materials, skills, money — which is thinnest right now, and what would it take to thicken it this year?
- What would you want to still be standing in eighty years that has your hand in it? Now write the smallest thing that would have to be true this month for that to remain possible.
ESSAY PROMPTS — five
Each is arguable from more than one side. Each requires at least one source the chapter cites and at least one it does not.
1. Attribution and authority. The chapter insists on distinguishing the recorded text of the Great Law from the seven-generation formulation and from its later commercial attribution. Argue either that this precision strengthens the principle's authority in policy and business use, or that the insistence on textual provenance imports a written-law standard onto an oral constitutional tradition and is itself a category error. Use Parker (1916) and the chapter's treatment, and at least one source on oral constitutional tradition or Haudenosaunee governance written by a Haudenosaunee author that the chapter does not cite.
2. The rate or the horizon? Chapter III.05 argues that the discount rate gets the attention while the horizon does the damage. This chapter shows an indifference rate of 4.51 percent between a 40-year and a 200-year design. Take a position on which of the two parameters should carry the governance weight — a mandated declining rate schedule, or a mandated minimum appraisal horizon tied to the asset's design life. Engage Weitzman (1998) or Gollier (2012) directly, and at least one national appraisal guidance document the chapter does not cite.
3. Endowment as enclosure. The maintenance endowment converts a future obligation into present capital held in trust. Argue the counter-case: that endowing assets concentrates decision rights in trustees who are accountable to a deed rather than to living people, and that a large enough stock of perpetual trusts is a transfer of governance from the present to the dead. Use the National Trust's Chorley Formula and the chapter's arithmetic, and at least one source on perpetuities, dead-hand control or endowment governance that the chapter does not cite.
4. The Elwha, from both ends. Write the strongest case that building the Elwha and Glines Canyon dams was the right decision on the information available in 1913 and 1927 — then the strongest case that it was not, given that Washington State law had required fishways since
- Conclude with what a 1913 board would have needed in front of it to decide
differently, and whether any instrument in this chapter would have supplied it. Use the NPS and USGS material the chapter cites, and at least one account of early twentieth-century hydropower or fisheries regulation that it does not.
5. Permanence against renewability. The chapter's central claim is that durability arguments should be reframed as renewability arguments — that Ise Jingu, rebuilt every twenty years, is a better model of a long-lived asset than a monolithic hundred-year structure. Argue against it: that renewal cycles depend on continuous institutional wealth and social stability that most organisations and most countries do not have, and that material permanence is precisely the technology for surviving institutional discontinuity. Use Brand (1994 or 1999) and the chapter's Ise figures, and at least one source on institutional collapse, heritage loss or infrastructure abandonment that the chapter does not cite.