Which of the following would NOT be considered a determinant of marginal productivity?

Which of the following products allows the seller to identify different groups of consumers (segment the market) at virtually no cost?

A) early bird dinner specials B) a pair of Bose speakers C) iPhones D) books sold online

An increase in net foreign investment is possible through a decrease in national saving or a decrease in domestic investment

Indicate whether the statement is true or false