Ifaproductisexcludable,whenonepersonconsumetheproduct,othersarenotabletoconsumetheproductatthesameinstance.Forexample,allofyourprivatethingsareexcludable.
Ifagoodisrival,whensomepeopleconsumethesameproducttogether,thesatisfactionforanyoftheconsumerwilbeloweriftheyconsumethegoodbytheirown.Forexample,thestreetlightisconsiderednon-rivalbecausemanypeoplecouldenjoythelightwithoutdiminishingothers'satisfaction.
Comeon,youarestudyingA-levelcurriculum,right?ItisreallyabasicskillforyoutoreadtheEnglishlikethis.