Post 788: The European flag

A tale of nested conspiracies in four-and-a-half fits - ideally it would have been post 666

For my swan-song I’ll supply the faithful with a tall tale of the sort that induced Mark to invite me on to his blog. I’m sure he would have enjoyed the mixture of verifiable truths, multiple ironies, and fuel for nested conspiracy theories.

Epi-prologue: the flag

It’s a good symbol. The ring of stars evokes an ideal of common values and aspirations, as in Schiller’s Ode to Joy:Űber Sternen mu er wohnen”. The empty space it defines but does not enclose invites states and citizens to fill it with the meaning and praxis they choose. Unlike the Ode, picked as the European anthem, it is not impossibly élitist for amateur use (*).

The circle of stars is not standard heraldry. The one previous use I could find was the shortlived 13-star Betsy Ross flag of the American revolutionaries. This was replaced progressively by the rectangular arrangement of today, with one star for each state, as settled in 1818. There is no reason to think the Eurocrats were inspired by the Betsy Ross, or had even heard of it. So where did the 12-star European flag come from? It never corresponded to the number of members of any European institution at the times of adoption.

I tell the story in reverse chronological order, like the detective explaining the murder to the assembled suspects in the drawing-room of the snowbound country house. In honour of Lewis Carroll, whose world we are plainly living in, the sections are called “fits”.
Continue reading “Post 788: The European flag”

Adieu to the felon Trump

A last chance for commenters to let off steam.

The loyal remnant of RBC readers deserve one last chance to let off steam about Donald Trump.

Your budget foreign soothsayer predicts:

1. Based on current polls: Joe Biden will be elected President in November, quite comfortably (high probability, strong evidence, as the IPCC would say). Democrats will get a thin majority in the Senate (medium probability, weak evidence) and hold their 2018 gains in the House.

2. “In one year many things can happen. I may die. The king may die. And perchance the horse will learn to sing.”  Biden, Trump and Murdoch are all old men, living like me through a dangerous pandemic. Life insurance salesmen are not queuing at our doors. There is a significant chance the election will not be between Biden and Trump. Suppose it’s a contest between Abrams and Hawley? The best you can say is that Ms Generic Democrat beats Mr Generic Republican. Fox News either stays the same or implodes; the upside is all for the Democrats.

3. Current polls do not reflect the full impact of the coronavirus disaster. Trump’s increasingly unhinged behaviour (injecting disinfectant? WTF?) suggests his lizard brain fears the worst, and it’s right to do so.

Cumulative US deaths today are 50,000, about at the peak daily rate. The total death toll will therefore be at least 100,000. Check: Spain today, well past the peak, is at 22,000. Say ultimate toll of 25,000. Scale up to the USA by population (x 7.6) and you get 190,000. Spain, after a poor start, now has a well-enforced national lockdown, credible plans for a phased exit, and a decent income support safety net. The poor US safety net is leading to a chaotic and premature lockdown exit, giving the pandemic a long tail and ensuring an anaemic economic recovery. These predictions are pretty safe. Together they could easily lead to a wave election defeat for Trump and his party, on a par with 1932.

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On behalf of all us bloggers, a heartfelt thank you to all our readers and commenters over the years.

Terawatt solar, halfway

A victory hobble down RBC memory lane

In January 2013 I published a long post on PV solar energy, under the grandiloquent title “Terawatt solar or bust”. For an inherently ephemeral blog post, it holds up pretty well. The heart of it was this table:

At the end of 2019, installed PV was 633 GW (Bloomberg NEF, via Wikipedia; may include a rough estimate of rooftop), with a central forecast of 770 GW for end 2020.

Half a terawatt is there already, and the second half can be expected for 2022. Yeah!

The EPIA/Greenpeace best scenario of 688 GW for 2020 was spot on. Remember that it was an outlier at the time, derided by the CW. The longhaired agitators at Greenpeace have turned out much better forecasters than the men in grey suits at the IEA.

My gloat is tempered by the fact that I tagged Greenpeace as too conservative, based on an extrapolation of past trends. I was wrong, and the growth rate did slow. I didn’t allow for the premature rush by many governments, from the UK to China, to phase out “unaffordable” solar subsidies too quickly. That exogenous shock has gone now, and there is little reason why solar should not get back on its previous fast track. Judging by their investment plans, Chinese PV manufacturers at least are betting on rapid growth.

What of the future? My dumb extrapolation had solar meeting the world’s entire energy demand of ca. 10 TW continuous soon after 2030. That implies 40 TW of solar at a 25% capacity factor. Say half would be wind instead, that’s still 20 TW of solar. A long way to go, but exponential growth is still the 500-lb gorilla that crushes everything in its path.

At current utility prices close to $1 per installed watt (*)  (modules are at 20c per watt), the cost would be about $20 trn, or $1.3 trn a year for 15 years. Global investment in all forms of energy was $1.85 trn in 2018 (IEA), of which $726 bn was for oil and gas, so the order of magnitude is as doable as it is necessary. Note that the increase is only in the upfront investment. It is now a truism (pointed out here by me in 2015) that the energy transition at worst breaks even over time, because the running costs of renewables are so low. It’s a huge bargain if you add in health and climate benefits.

(*) The NREL gives the average US cost in 2018 as $1.60/watt, with $1 at the bottom of the range, which will soon become the norm. OK. Round up to $2trn a year at worst if you insist.

I did get a few things right seven years ago:

- There has been no dramatic change in solar technology, just steady incremental improvements.

- A lot more attention is being paid to the future problem of firming large volumes of intermittent solar and wind without carbon emissions. (The immediate problem is being successfully managed by grid operators everywhere using gas turbines.)

I’d just like to highlight a couple of recent developments before we go.

One is Andrew Blakers’ 100% renewables scenario for Australia using current technology and costs . He showed it can be done, at less than current wholesale prices, using just four technologies: wind, solar, HVDC transmission, and off-river pumped hydro storage. The beauty of this minimalist approach is that you can add in riskier technologies – V2G, P2G, large-scale demand response, grid batteries - if they (a) work (b) make things cheaper. But the feasibility problem has been solved. Blakers followed up by answering the “no sites” objection to PUHS by creating a world atlas of potential sites, identified from satellite data. There are 616,000 of them. Bad luck for Estonia and the Netherlands, but most countries have plenty of options.

I suppose the big technology news in renewables in the last few years has been the sudden arrival of floating wind. The Norwegian oil company Equinor went from one test turbine to an operational wind farm without a hitch, and now other players are piling in. This opens up large areas of ocean off coasts with no continental shelf, especially the US West Coast and the Japanese Pacific one.

For entertainment value though, it’s hard to beat the even more rapid arrival of agrivoltaics. This is a Sybil Fawlty invention (“special subject – the bleeding obvious”) but welcome for all that. It turns out you can actually improve yields of some crops by growing them in partial shade under solar panels. Here’s a nice shot of a project in a vineyard in the Languedoc.

The French get their priorities right. The AI management software that steers the panels gives priority to protecting the vines from extreme weather, such as hail – a serious risk to high-quality vineyards in Burgundy and the Médoc. The setup even improves the wine, perhaps by cutting heat stress:

It has also been claimed the aromatic profile of the grape was improved in the agrivoltaic set-up, with 13% more anthocyanins – red pigments – and 9-14% more acidity.

A toast to solar energy: take over the world as fast as you can.

One last post to come.


The hero of Midway was not like Achilles.

Roland Emmerich’s Midway is on Amazon Prime, so I watched it.  As you would expect from the director of Independence Day, it’s a watchable, technically adept war movie at a Boys’ Own Paper level of subtlety and depth. If you are looking for an exploration of the stresses of command – Nimitz’ acceptance of a critical battle with no advantage of forces, only the edge of surprise – or of front-line combat, you will be disappointed. This is not an RBC recommendation.

Richard Halsey Best

But it does appear to be historically accurate. The events of Midway are sufficiently dramatic not to need embroidery. They even supplied an unambiguous real hero, Lt. Cdr. Richard Halsey Best, the dive-bomber pilot who scored hits on two Japanese carriers in the same day, the one in the Akagi’s hangar dooming the ship.

In the film, Best is played by English actor Ed Skrein as the archetypal talented bad boy who makes good on the day, a clone of the Tom Cruise character in Top Gun and similar action heroes. This characterisation by Emmerich reinforces a narrow stereotype. Hollywood does not always follow this – from Marshal Will Kane in High Noon to the portrayal of pacifist Marine paramedic Desmond Doss in Mel Gibson’s surprising Hacksaw Ridge - but it does so often enough for the stereotyping charge to carry weight.

It’s worth asking whether the portrayal of Best is true to life. It’s not inherently implausible; military pilots, like other combatants, can be nerveless daredevils. But it’s not the only possibility. Homer presents us in the Iliad with three different styles of warrior-hero: Achilles, the Top Chariot Fighter in the Hollywood mold, brave for glory and because he enjoys fighting; Hector, courageous out of honour and duty; and the calculating Odysseus, who is brave because he wants to win, to survive, and to go home to his wife and son. With striking realism, Homer has only the last survive.

So which of these three was closest to the real Richard Best? Surprisingly for such a pivotal and iconic figure, I could find no assessment of his character on the Internet. However, there are enough recorded facts to build a pretty good Identikit portrait.

1. Best married at age 22, and stayed married. I could find no reference to a divorce or remarriage.

2. As a young Navy pilot, he was picked in 1938 for a post as instructor at Pensacola. You do not choose reckless individualists for instructors, but men who can balance aggression and prudence, and can focus on the mission.

3. From Pensacola, he asked for a transfer to an operational dive-bomber squadron – not a fighter one. Fighter pilots win dogfights and glory; bomber pilots can sink ships and win battles. Why not torpedo bombers? Perhaps there was enough scuttlebutt about the obsolescence of the Douglas Devastator plane and its unreliable Mark 13 torpedo.

4. He was regularly promoted, and at Midway was a squadron commander under Air Group Commander Wade McCluskey. Emmerich’s film has them both given field promotions by Halsey in extremis, which is not plausible.

5. In the first attack on the Japanese fleet at Midway, most of the 31 American dive-bombers attacked the Kaga. McCluskey’s claimed orders to split forces were not received. Best noticed the mistake and, without orders, took his two wingmen, Lt. Kroeger and Ensign Weber, to attack the Akagi. Amazingly this tiny force not only survived but destroyed the carrier. Weber was killed in the successful afternoon attack on the Hiryu, but Kroeger survived the war and lived to 89.

6. Best suffered serious damage to his lungs during the day from a faulty ventilator and was hospitalised. He developed full TB, and was invalided out. He never flew for the Navy again – or, as far as I can find out, at all. You would think that if his passion was flying as such, a war hero and master pilot like Best could have found a way to stay in the air, at least for recreation.

7. After leaving the Navy in 1944, Best held two responsible desk jobs: “After discharge from the hospital, Best worked in a small research division of the Douglas Aircraft Corporation. This division became part of the Rand Corporation in December 1948, where Best headed the security department until his retirement in March 1975” (Wikipedia). These do not look like sinecures. Both companies were important and unsentimental military contractors and prime targets for Soviet espionage. Running security for Rand may not have been physically demanding, but it demanded sharp wits and an eye for detail.

I don’t want to understate the sheer nerve required to put a warplane into a near-vertical dive over an enemy warship firing at you with every gun it has, not to release your bomb until you are certain, and to pull out of the dive at the last second before crashing. Still, Best’s CV reads like Odysseus not Achilles to me. I think he risked his life twice on the same day not to show how brave he was, or even out of a high sense of duty, but because he was determined for the United States to win the war.

Corrections and additions welcome.

PS: There is of course a wider debate about heroism, as the coronavirus crisis reminds us daily. The classical Greek authors expanded the canon of heroism to women like Andromache, Cassandra and Antigone, and men like Orestes who struggle with a profound ethical dilemma. Hollywood should follow their example.

The coronavirus disaster in Brazil

Brazil should take the Imperial College models seriously.

This post is mainly intended for my Brazilian family and friends, since it’s too long for a Facebook post. Others may find it a change from their local tragedies.

Imagine a big country with an unqualified populist elected as President who compares the Covid-19 virus to the flu, has accused the media of hyping the risk for underhand political motives, challenges death statistics, picks a fight with the governor of the most populous state including its largest city, talks frequently of an early return to work, and disregards social distancing rules himself? Not the USA but Brazil under Jair Bolsonaro. See also Wikipedia. Meanwhile the plague advances as desperate state governors declare uncoordinated lockdowns, and health care professionals complain of a shortage of masks and ventilators, well before any peak. Some drug kingpins are enforcing lockdown in their favela fiefdoms at gunpoint.

Remember that sickening moment on 9/11 when you realized that the collapsing skyscrapers were not from a disaster movie, but the horrifyingly real thing? That’s Brazil today.

Into this chaos step the high-minded foreign experts. On March 26, the industrious mathematical epidemiologists at Imperial College (Walker, Whittaker et multi) released their Report 12 (pdf) extending their scenarios from the UK and the USA, as in report 9, to 102 countries. The O Globo newspaper got hold of the data spreadsheet (xls here; extract for Brazil only by me here) and published what looks like an accurate summary. Judging by the Facebook posts of my Brazilian acquaintances, this was greeted with widespread incredulity. Let me try to persuade them to take it seriously.

To recap, the Imperial team modelled three main mitigation scenarios for this country of 212 million inhabitants. They put in various values of R from 2.4 to 3.3, and assumed social distancing would be about 40% effective . They define R thus: “R0 : Basic Reproduction number (average number of secondary infections by a typical infection in an unconstrained epidemic and wholly susceptible population).”

A – no mitigation at all:

  • total ultimate infections             183m – 188m
  • total deaths                                       908,000 – 1,152,000,
  • total critical hospitalizations    1,466,000
  • peak critical bed demand            470,000

B – social distancing (40%) only for the elderly:

  • total ultimate infections             92m- 121m
  • total deaths                                       271,000 – 530,000
  • total critical hospitalizations    359,000 – 703,000

C - social distancing (40%) for the entire population:

  • total ultimate infections             95m- 122m
  • total deaths                                       452,000 - 627,000
  • total critical hospitalizations   600,000 – 831,000

What to think of this?

1. It’s state-of-the-art professional modelling. The parameters are put in from the latest data, especially Chinese. Put in different parameters, and you get different results. But you can’t just make up your own parameters, you need a reason. A bigger number of asymptomatic carriers? Maybe; it lowers the total of infections in Scenario A, as you hit herd immunity sooner, but the higher pace of infection exacerbates the peak load on hospitals. Wishful thinking in the Trump/Bolsonaro style does not hack it.

2. The least reliable scenario is A, the disaster one in which no action is taken. This won’t happen, anywhere, for two opposite reasons. One: even if central governments fail, as in the USA, Mexico and Brazil, lower levels of government step in – less effectively, but they will act. If the worst comes to the worst, people will just self-isolate, as Isaac Newton did in the London bubonic plague of 1665. (Incidentally, this is why the “economy vs. public health” opposition is a false one. The economy tanks sooner or later, whatever the government does.) Two: a reason, this time on the bad side, for distrusting scenario A is that it does not allow for hospital collapse, which would be inevitable. Death rates would rocket, unpredictably. The model is benchmarked on the Chinese health care system which never faced such extreme loads.

3. The key conclusion of the Imperial reports is that mitigation isn’t enough, you have to go for energetic suppression to keep the health system from collapsing. Even the lowest Imperial mitigation scenario has over 2m hospitalisations in Brazil, 360,000 of them critical ones. Brazil has 415,000 hospital beds, just adequate for normal times. Any mitigation scenario leads to hospital collapse. Unfortunately they do not offer suppression scenarios, impossible for so many countries at once. So the Brazilian government has to put some work into this to avoid the catastrophe.

Stepping outside the report, there are now plenty of examples of successful suppression strategies.

Gold medal: Taiwan, silver medal: South Korea. These have not SFIK relied on fancy models at all but on the trusty Epidemics 101 playbook: test, track, isolate. The playbook was it seems first worked out for animal diseases before WWI. The part about “slaughter all the infected animals, dump the carcasses in a big pit, and burn the animal sheds” has been toned down for humans, but the take-no-prisoners attitude survives. One quarantine violator in Taiwan was fined $33,000. The Vice-President is an epidemiologist. I doubt if Brazil has the administrative capacity or social cohesion for this, and anyway it’s too late.

Second best is Europe. After a late start, most countries adopted strict lockdowns to drive R below 1 quickly. They are working. In Spain where I live, a state of emergency and national lockdown was declared on March 15. New deaths peaked on April 1. Cumulative deaths on that date stood at 10,003. Assume the curve is symmetrical, and total deaths will end up around 20,000. Scale that to Brazil, and you would get 99,000.

That would be a decent second-best outcome starting from now (cases 20,247, deaths 1,090). I’m afraid I don’t believe it. Spain has a competent and rational government and civil service, a first-world healthcare system, and a surprisingly deep reserve of social solidarity in spite of political divisions. Brazil has much lower levels of trust in government, very high inequality, and a healthcare system overstretched in normal times. In addition to these structural handicaps, it has, like the USA, unwisely elected an erratic and irrational President incapable of offering the example of steadiness and discipline required by the situation*, The country will IMHO be lucky to escape with under 200,000 deaths. It could easily be worse.

* Epidemic management is a Roman dictatorship of public health experts. What political leaders have to do is hand over the keys and make frequent sober and statesmanlike statements. A good number of quite ordinary politicians have shown themselves up to this: Xi Jinping, Moon Jae-in, Merkel, Conte, Sanchez, Cuomo, Newsom, even Matt Hancock, the previously unimpressive British Health Secretary. The failures are striking: Trump, Obrador, Bolsonaro, Abe.

Anglo-Saxon thought for the day

From The Battle of Maldon.

Dedicated to the exhausted army of doctors, nurses, and ancillary workers who have woken up in many countries to another endless day of struggle against a faceless epidemic. And particularly to those who relax reading Anglo-Saxon poetry.

From The Battle of Maldon, ca. 1000 CE. The Saxon war-leader Byrhtnoth has been killed and his band is losing the battle to the Viking invaders; some Saxons have run away. His old retainer Byrhtwold speaks to the remnant standing fast. Try reading it aloud to catch the alliteration. The letter þ is a voiced “th”. [Update: sound file on YouTube.]

Hige sceal þē heardra, heorte þē cēnre,
mōd sceal þē māre, þē ūre mægen lytlað.

Thought shall be the harder, heart the keener,
Mood [mind, courage] the more, as our might lessens [lit: littles.].

Suitably, the text is incomplete, and breaks off before the battle ends. We don’t know who wins - then or now.






Newton self-isolates

Newton’s prism experiment retold.

As a way of putting enforced seclusion to good use, it’s hard to beat Newton’s optics.

You all know the story in outline. In 1665 the bubonic plague that devastated London reached Cambridge, where Newton was a freshly minted B.A. (Cantab.) He fled to his uncle’s farm in Lincolnshire. This is now called Woolsthorpe Manor, though it’s more the farmhouse of a prosperous yeoman. He took with him a pair of prisms, with which he destroyed the prevailing theory of colour with a devastating experiment. We all know that Newton discovered, or rediscovered, the colour spectrum using a glass prism placed in a beam of light. But the real breakthrough came from the second prism.

Brief flashback. This prevailing theory was a common-sense one. White sunlight passes through a stained-glass window. It becomes blue or red or yellow. It’s the medium, the stained glass, that gives the colour, right?  As Shelley wrote, 150 years later:

Life, like a dome of many-colored glass,
Stains the white radiance of eternity.


The usual story is that Newton hid out in a barn. His own sketch of the experiment disproves this.

Barns don’t have small, square, high windows. Bedrooms do – like those on the first floor of the house. Glazed windows were gradually adopted in England in the course of the 17th century. As like as not, the bedrooms in the Newton farmhouse still only had stout wooden shutters to keep out the cold Lincolnshire winds: shutters with cracks in them.

The sketch clearly shows what Newton did. He placed prism 1 in a beam of sunlight passing through a crack or hole in the shutter, producing the familiar spectrum. Where did these colours spring from? Perhaps it was the medium again, the prism glass, as Descartes had proposed. Newton constructed a screen with a ladder of more holes to allow him to isolate the different colours. He placed prism 2 in the red, blue, .. light – and it stayed put. Schematically:

It doesn’t make sense that prism 1 would create colours and identical prism 2 do nothing to them. (To be quite sure you would need to replicate with prisms made from different sources of glass, but that was quickly done.) So the colours were in the light to begin with.

The illusion is white light, really a bundle of different colours. More disturbingly to our intuition, a perceived colour is a negative property. The stained glass absorbs all the other colours than the blue we see. Leaves are green because that wavelength is not absorbed by chlorophyll, which is tuned to blue and red.

It took Newton five years to write this all up into a full theory of optics. It was his 1672 paper on this that made him deservedly famous. Gravity came later (1687), though he started on that in the farmhouse too.

Go on. Crack string theory.

Ambroise Paré’s COVID advice

Look at emergency home nursing.

The surgeon to François Ier of France, Ambroise Paré, gave this classic statement of the doctor’s mission:

Guérir parfois, soulager souvent, consoler toujours.

In his day, there were few hospitals. Most people were born, went to their beds when they fell sick, recovered a few times, and finally died, all in their own homes. It wasn’t much different in 50,000 BC. Hospitals were for the few mobile categories: soldiers, seamen, merchants, pilgrims. Paré would have done most of his surgery in tents in the rear of the battlefield.

Florence Nightingale at Scutari - Shutterstock

The hospital, as a temple of scientific medicine, is a 19th-century invention. The Dr. House TV series offers an exaggerated but basically fair image of its ethos. The model is badly adapted to a massive epidemic of nearly identical cases. In parts of Lombardy, hospitals have been overwhelmed, and resorted to triage. The older arrivals with preexisting conditions have reportedly sometimes been left in corridors to die with minimal palliative care. Ethically, this is not really problematic; in human terms, it is horrific. The same is very likely to happen in many other countries, including the UK and the USA (here, report 9).

I am 73 with asthma. I therefore have a personal stake in this problem, which has started to arise in Madrid. The army are setting up large improvised field hospitals. This fixes the bed shortage, and I trust that crash programmes are under way to make respirators and masks, but you can’t create qualified nurses in a few weeks.

So you enlist unqualified ones. Go back to the 18th century, and ask family members to care for the sick at home. Patients who fail the hospital triage would be sent home with a Happy Care package, including an army or airline-issue respirator, a bottle of oxygen, a box of antibiotics and opioids, a bedpan, a one-page guide, and a Skype helpline.

Every medical professional from Florence Nightingale to Geoffrey House will be shocked by this unprofessional atavism. But the objections are readily answered.

1. Half or more will die! Sure. The basis of comparison is not best or even average hospital practice, but the horrid reality of the triage corridor. At the very least, the sick will die with more dignity and human warmth.

2. The potential carers have to go out to work. Not just now they don’t.

3. The patients will infect the carers. They are already infected.

4. Not every patient has potential home carers physically and mentally fit enough to do the job. Absolutely. Home nursing is only part of the solution. That’s why we also need the army field hospitals. I can’t guess the relative numbers here.

An additional twist to this plan is that there is a rapidly expanding cohort of asymptomatic or recovered people with immunity, who are potentially available to support others, though home nursing assistance among other ways. In Veneto province in Italy, which has tested heavily, about 8% of the population tests positive, two-thirds without symptoms or nearly so.

If it comes to such a choice for me, I would take the home solution over the corridor. I don’t know what Lu thinks.

I really would like to know what the heirs of Florence and Ambroise make of this. If  anything on these lines is the way forward, or even a last-ditch fallback, it has to be planned for.

De Long is wrong on coronavirus

If you are going to quarantine, do it soon.

It’s not often one gets the chance and obligation to say this. Brad DeLong :

Note to Self: Is there anything wrong with this analysis? With 14 deaths in the U.S., a 1% death rate, and 4 weeks between infection and death, that means that as of Feb 8 there were 1400 coronavirus cases in the United States. If it is doubling every seven days, then now about 22,000 people have and in the next week about 44,000 people in the U.S. will catch coronavirus. These numbers could be five times too big. These numbers could be five times too small. But with only 1 in 10,000 currently affected, it seems 4 or 5 weeks early to start imposing serious geographical quarantines …

No, no, no. R is not a function of the number of cases. It is only a function of herd immunity and the individual chance of transmission.

The condition for the decline and fall of the epidemic is lowering R below 1. There are two paths to this. Call them the Trump policy and the Xi policy.

Under the Trump policy of malign neglect, the virus spreads until most of the potential transmittees of the virus have recovered from it and are immune. Meanwhile, the cemeteries have filled up with those who didn’t recover. 200,000? 480,000? 1.7 million, if the hospitals collapse and the treatment is back to Black Death standards? The epidemic expires from satiety.

Under the Xi policy (also now the Moon, Conte, Sanchez, and Merkel policy), the state cuts the opportunities for transmission, including quarantines as well as contact tracing and mass preventive screening. The cost of this, direct and indirect, is fixed and independent of the number of cases. Imagine a perfect lockdown in which everybody stays in their house or flat, living out of tins by candlelight, for a fortnight: end of epidemic. This can’t be done perfectly of course, so real outcomes are a risk distribution, but you can get pretty close, as Singapore and Taiwan have shown. The death toll is still 1% or 1.6% or whatever of those infected.

It is lower the earlier you start the policy. Starting when the diagnosed cases are in the thousands, as seems to be the political trigger, looks as if it might limit ultimate deaths also to the thousands or tens of thousands. QED.

Lego clone army

A more picturesque way of looking at this is from the point of view of the virus. It’s a clone army of dumb replicants with no leader and a single mission: reproduce. For the Virus Army as a whole, a pandemic is a death ride. At the end of it they will all be dead, apart from the small source population living quietly in non-fatal parasitism with its animal hosts. The fun part is how many non-standard hosts they can kill along the way.

No zoom in on the virus commando that has infiltrated a single human host, you. The commando is doomed. In 14 days, either you are dead (end of viruses) or your immune system has destroyed them all and you are recovered (end of viruses). Their only hope for reproduction is for some members of the commando to jump ship and invade another disarmed host. The jumping ship is nearly always fatal, as the viruses can only survive a few hours outside a host. They have no independent motility and are dependent on cooperation by the hosts: handshakes, kisses, cough aerosols, unwiped door handles. Reduce that cooperation, and the survival odds for SEAL Team Virus drop to almost nothing. That, in essence, is the Xi policy: and it works.