According to the Islamic Economics, which of the following should be the return for an investor?

The United States has the highest rate of poverty in the industrial world. According to data collected, the average family income of the poorest 20% of the population declined by 10.9% from 1979 to 1986. Meanwhile, the average family income of the richest 20% of the country increased by 13.8% Research seems to indicate that this decline has been caused by slow economic growth in the early and mid 1980s while there has been a major redistribution of income from lower-income families toward the most affluent. Which of the following conclusions can be deduced from the above text?

Cash flow statement is prepared according to