<Table> <Tr> <Th> Economic sectors </Th> </Tr> <Tr> <Th> Three - sector theory </Th> </Tr> <Tr> <Td> Primary sector: raw materials Secondary sector: manufacturing Tertiary sector: services </Td> </Tr> <Tr> <Th> Additional sectors </Th> </Tr> <Tr> <Td> Quaternary sector: information services Quinary sector: human services </Td> </Tr> <Tr> <Th> Theorists </Th> </Tr> <Tr> <Td> AGB Fisher Colin Clark Jean Fourastié </Td> </Tr> <Tr> <Th> Sectors by ownership </Th> </Tr> <Tr> <Td> Business sector Private sector Public sector Voluntary sector </Td> </Tr> <Tr> <Td> <Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> </Td> </Tr> </Table> <Tr> <Th> Economic sectors </Th> </Tr> <Tr> <Th> Three - sector theory </Th> </Tr>

Where do you think tertiary industries are most likely to be concentrated why