The policy objective that gainers from a policy change (or project) could compensate the losers from the change and still be better off. In particular note that a policy that passes this criterion does not need to include the compensation, the compensation merely has to be possible
POTENTIAL PARETO IMPROVEMENT CRITERION
Meaning of POTENTIAL PARETO IMPROVEMENT CRITERION in English
Environmental economics English glossary. Английский глоссарий экономики окружающей среды. 2012