In 1997, households originated only 16 percent of First-Class mail, down from 23 percent in 1990.
This is due to a number of reasons, but mostly it is because of price.
mnli hypothesis: This is due to a number of reasons, but mostly it is because of price. premise: In 1997, households originated only 16 percent of First-Class mail, down from 23 percent in 1990.