Counting the damage properly

A headline figure for war damage is quoted constantly and understood rarely. It is worth setting out how such an assessment is actually constructed, because the method determines what the number can and cannot be used for.

Damage is not needs

Damage is the replacement value of what was destroyed. Needs is what it would cost to restore function, which is a different and usually larger figure, because restoring a service means meeting current standards rather than rebuilding what stood before.

Losses are a third category: the economic activity that did not happen. Adding the three together and quoting the total is the most common misuse of these assessments.

How the assessment is built

Sector by sector — housing, transport, energy, agriculture, health, education, industry — each with its own team and its own unit costs.

Data comes from satellite imagery, administrative records, utility and operator reports and field verification where access allows. Each source has a known bias, and the methodology says which was used where.

Verification is what gives the number standing: the assessment is produced jointly with international institutions rather than by the affected government alone, precisely so that the figure can be used in financing decisions.

Why the methodology matters more than the total

Because the total will be revised, repeatedly, and a revision is treated as a scandal by people who did not read the confidence intervals in the first place.

What the assessment is actually for is allocation: it tells a ministry and a lender which sector and which region needs what, in a form both can act on.

The practical use

Read the sector tables, not the headline. That is where the decisions are actually made.

I judge whether a figure means anything by looking at the unit rates underneath it; anyone who has priced a bill of quantities knows the total is an output of the method. Damage and needs differ for the same reason: rebuilding what was destroyed and building what is now required are two different budgets. Arguing about the total is easy and reading the methodology is hard, but the methodology is what decides.