narrower concept age Concept average Concept building age Concept building type Concept child Concept cubical content Concept dwelling age Concept flat let for rent Concept income Concept increase in value Concept level of employment Concept man Concept pay Concept production value Concept productivity Concept profession Concept purchase price Concept quantity Concept residential property Concept sex Concept structure age Concept time Concept turnover Concept woman Concept working-hours Concept year Concept