Episode Details

This week we talk about the Pacific Palisades, Hurricane Katrina, and reinsurance.

We also discuss developed property values, arsons, and the cost of disasters.

Recommended Book: The Data Detective by Tim Harford

Transcript

Natural disasters, whether we’re talking about storms or fires or earthquakes, or some combination of those and other often related issues, like flooding, can be incredibly expensive.

This has always been true, both in terms of lives and material damage caused, but also in terms of raw currency—the value of stuff that’s destroyed and thus has to be rebuilt, replaced, or in some rare cases partitioned off so that similar things don’t happen in the future, or because the space is just so irreparably demolished that it’s not cost effective to do anything with the land, moving forward.

The four most expensive natural disasters that we’ve been able to tally—so this doesn’t include historical disasters that are far enough back that we can’t really quantify the damage, due to an inability to directly compare, or insufficient data upon which to base such quantification—the top four that we can line up against other such disasters and compare the numbers for are all earthquakes.

The earthquake in Japan in 2011 that, in addition to causing a lot of damage unto itself, also caused the disaster at the Fukushima nuclear plant tops the list, with a cost at the time of around $360 billion, which would be nearly $490 billion in today’s dollars.

The second most expensive natural disaster is also an earthquake in Japan, this one hitting a region called Hanshin in 1995, causing about $200 billion worth of damage in mid-90s money, which would be about $400 billion, today, and the third was an earthquake not too long ago, the 2023 quake that struck along Turkey and Syria’s border, causing something like $160 billion in damage.

The fourth costliest natural disaster hit China in 2008, causing around $130 billion in damage, which is about $184 billion in today’s money.

These disasters also caused a lot of casualties and deaths; about 20,000 people died in that most-costly, nuclear-incident-triggering quake, while nearly 88,000 were killed in that fourth-most-costly, Chinese one.

The Great Hanshin quake, in comparison, lead to somewhere around 6,000 deaths: which is still just a staggering human loss, but it’s an order of magnitude less than in those other comparable disasters; which hints at the trend we see with these sorts of events—the scale of wounded and killed doesn’t necessarily correlate with the scale of costs associated with damaged and destroyed infrastructure and other assets.

The costliest natural disaster in US history, as of the first week of 2025, at least, was Hurricane Katrina back in 2005, which all but destroyed the city of New Orleans and much of the surrounding area, causing around $125 billion in damage, which is equivalent to about $195 billion, today, but it only led to around 1,400 deaths: again, all of those deaths absolute tragedies, and any disaster that causes that many deaths is an historical event. But looking at the raw numbers, that’s a shockingly low figure compared to the sum of the monetary damages tallied; it’s actually remarkable as few people died as they did, looking at this storm and it’s impacts through that lens.

What I’d like to talk about today is another natural disaster, this one ongoing as I record this, that looks primed to take the record of most-costly, in terms of money, US natural disaster from Katrina, and some of the implications of this disaster.

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Part of why disasters in the US, natural or otherwise, tend to result in fewer fatalities than those that occur elsewhere is that the US is a very wealthy country with relatively high-quality and widely dispersed infrastructure.

There are