<Tr> <Td> United States portal </Td> </Tr> <Tr> <Td> <Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> </Td> </Tr> <Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> <P> Causes of income inequality in the United States describes why changes in the country's income distribution are occurring . This topic is subject to extensive ongoing research, media attention, and political interest, as it involves how the national income of the country is split among its people at various income levels . </P>

Which of the following are explanations for income​ differences