Sentencing length inflates apparent criminal mass

Cross‑national lifetime conviction or imprisonment rates depend not only on how many people offend but on how long systems incarcerate them. Shorter sentences (e.g., Denmark's modal unsuspended prison terms of 1–2 months) produce lower point‑in‑time prison populations despite nontrivial lifetime conviction rates; conversely, long U.S. sentences raise the share of people who ever experience long‑term imprisonment. — This reframes debates about 'why the U.S. imprisons so many' from a simplistic 'more criminals' narrative to a policy‑driven difference in sentence length and measurement (lifetime risk vs point prevalence), affecting sentencing reform, budgeting, and international comparisons.