In the circular flow of expenditure and income, why must the total value of production in an economy equal the total value of income? a. every penny spent on a good or service must end up as someone's income. b. domestic expenditures on imports generally equal foreign expenditures on u. s. exports. c. taxes on the production of goods and services are determined according to individual income. d. people tend to spend all of their income on goods and services.

the arab empire adopted the muslim religion as their main belief. arabs would influence the people from the territories they invaded towards islam (the muslim belief).

nevertheless, throughout the history of the arab empire, rulers brought intellectual individuals from other religions to their centers of learning. these other foreigners included jews, christians, greeks, persians, and indians.   these resulted in the adoption of important knowledge developed by these cultures by the arabic empire. for example, the works of aristotle were translated from greek to arab and indian scientists brought the numerical concept of "zero" to the arabs.

nowadays, 93% of the arab population is muslim, which at the same time is subdivided in sects including the sunni, zaini, alawi, shia. the remaining 7% is composed mainly of christians.

answer; the president uses mass media to gain support for policies;