For instance, when reporting data from a large city, it might be appropriate to give the average income for black males aged between 50 and 60. However, doing this for a town that only has two black males in this age group would be a breach of privacy because either of those persons, knowing his own income and the reported average, could determine the other man's income.
For insTanCe, whEN REpORTInG DATa fRom A Large CITy, iT MiGHt bE apPRopriAte to gIve the AVeRage Income for black mAles AgED betwEen 50 and 60. hOWever, doInG tHIs FOr a town tHAt OnlY has TwO blAcK MaleS iN this age Group woULd be a breaCH of privACY becauSe EithEr of tHOse peRsonS, knowing HIs OwN incOme and the RepOrTeD aVeragE, COULD dEteRmINE tHe oTHEr man's incomE.