LHC Upgrade Returns Nearly Twice Its Cost, Study Finds

The High-Luminosity LHC (HL-LHC) is one of the most ambitious projects undertaken by society, and its worth can be difficult to quantify in conventional economic terms. To address this challenge, a team at the University of Milan and CSIL developed a cost-benefit analysis (CBA) over more than a decade.

The CBA focuses on the measurable side effects of the investment, such as training early-stage researchers and technological gains from supplier firms, rather than the intrinsic value of scientific results. This approach is deliberately conservative, as the knowledge produced by the machine comes in addition to, not as part of, the calculated return.

The study's accounting window runs from 1993, when expenditure began, to 2038, the expected end of operations at the time of the analysis. All sums are expressed in constant 2016 Swiss francs, removing the effect of inflation. The team used Monte Carlo simulation to handle uncertainty, treating 15 critical parameters as random variables.

The results indicate that each Swiss franc invested returns about 1.8 francs in societal benefits, with a 94% chance of a positive social return against the LHC counterfactual. The most valuable benefit is the training of early-stage researchers, which accounts for roughly 40% of incremental benefits.