In the flow of income and spending, saving and investment are, respectively:

Marginal social cost is equal to ________

A) marginal private cost plus the marginal external cost B) the marginal external cost C) the value of the tax that will make the market efficient D) the marginal cost imposed on people other than the producer of the good

The majority of blacks were shipped from West Africa, but some also came from Madagascar and Zanzibar

Indicate whether the statement is true or false