"If this interpretation is true, what Björk et al. (2021) find is that information and signaling is far more important than the strictness of the lockdown. There may be other interpretations, but the point is that studies focusing on timing cannot differentiate between these interpretations. However, if lockdowns have a notable effect, we should see this effect regardless of the timing, and we should identify this effect more correctly by excluding studies that exclusively analyze timing."
"It's absurd to claim that lockdowns don't work when a country like Vietnam (100 million people, first detected cases of COVID-19 community spread outside China) had <100 total COVID-19 deaths in 2020"
Many countries claim an improbably low level of COVID death. That doesn't mean their numbers can be taken at face value, although poorer countries do seem to be less worse hit simply because they have far fewer weak, obese and elderly people to begin with.
It's certainly not absurd to claim lockdowns don't work. You're attempting to refute a meta-analysis of studies looking at all the data with the example of a single country. That's meaningless. A single data point can falsify a theory but it cannot prove a theory. To prove lockdowns work there has to be a consistent impact of the policy.
"Lockdowns" is shorthand for "people not coming into contact with other people in a way that spreads the virus"
It's shorthand for a set of government policies that were intended to reduce contact, not eliminate it, because "not coming into contact with other people" is impossible. People still have to go to shops, hospitals, care homes, live with each other, travel around and so on even during a lockdown.
Your belief that it's "completely absurd" to say lockdowns don't affect mortality is based on the kind of abstract but false reasoning that consistently leads epidemiologists astray. Consider a simple scenario in which lockdowns have no effect that's still compatible with germ theory - you're exposed to the virus normally 10 times per week every week. With lockdowns that drops to 5 times a week. It doesn't matter. Everyone is still exposed frequently enough that there will be no difference in outcomes.
"Because the virus cannot teleport through walls, lockdowns necessarily prevent transmission"
https://www.washingtonpost.com/archive/politics/2003/04/18/i...
Viruses can in fact teleport through walls: "The SARS virus that infected hundreds of people in a 33-story Hong Kong apartment tower probably spread in part by traveling through bathroom drainpipes, officials said yesterday in what would be a disturbing new confirmation of the microbe's versatility."
In this scenario, lockdowns work fine, but are insufficient! Perhaps with stringent use of N95 masks during contactless food ration delivery it can be reduced to 0.05 times per week. Then the pandemic ends and we go back to normal.
Also, if you only go out half as often, that's not exactly a lockdown either. A lockdown is people not coming into contact with other people in a way that spreads the virus. It's not people still often coming into contact with other people in a way that spreads the virus but not as often as before.
This kind of completely irrational reasoning is exactly why lockdowns are now discredited. The fact that the response to "here's lots of data showing that lockdowns didn't work" is to demand an impossible level of lockdown that would kill far more people than COVID ever could simply through supply chain collapse alone, really does say it all.
That might be a definition issue. Here in Germany, we had several lockdowns. Many (most?) countries would say we had no lockdown at all.
Antivaxxers often bring up papers concluding that mask mandates don't work, as evidence that masks don't work.
> First, people respond to dangers outside their door. When a pandemic rages, people believe in social distancing regardless of what the government mandates. So, we believe that Allen (2021) is right, when he concludes, “The ineffectiveness [of lockdowns] stemmed from individual changes in behavior: either non-compliance or behavior that mimicked lockdowns.”
> Third, even if lockdowns are successful in initially reducing the spread of COVID-19, the behavioral response may counteract the effect completely, as people respond to the lower risk by changing behavior
Since it is an obvious consequence of the germ theory of disease that isolation stops the spread of disease, the only real question is if lockdowns are efficient at enforcing isolation (and in what conditions, with what costs etc). At best, the paper concludes that they are not, and that government propaganda about the risks of the disease works as well or better.
> You're attempting to refute a meta-analysis of studies looking at all the data with the example of a single country. That's meaningless. A single data point can falsify a theory but it cannot prove a theory. To prove lockdowns work there has to be a consistent impact of the policy.
I would say the null hypothesis would be that lockdowns do work, by relatively simple, almost mechanical, principles (lockdown forces isolation, isolation means the virus can't physically get from one person to another).
And there is basically no country that hasn't seen significant isolation that did well in the pandemic. Whether that isolation was caused by efective, if perhaps draconic lockdowns (such as in China or Vietnam) or by cultural norms and self preservation (such as in Finland or Norway), this remains true.
The real exceptions are countries that successfully isolated themselves from the outside world, and thereafter isolated only those carrying the virus, through broder closures and strict quarantine requirements plus testing - Taiwan, New Zealand are examples of such.
For this type of response, using broad statistical studies that equate very different ground-level phenomena (lockdowns varied wildly in form and in the degree of compliance, but the paper ignores all that in its quantitative data) to make it look good on a graph are mostly misleading - but what more can you expect from three economists dabbling their hand at epidemiology and sociology?
Overall it seems that they would have been better served by adding lockdown compliance to their models, which would likely explain much of the difference. It's absurd to claim that lockdowns don't work when a country like Vietnam (100 million people, first detected cases of COVID-19 community spread outside China) had <100 total COVID-19 deaths in 2020. Strict targeted lockdowns, strict isolation requirements after every identified case, for contacts up to the third degree ( contact of someone who was a contact of someone who came in contact with a patient) - these all must have played a role, and any study that fails to explain such extreme success is simply flawed.