How can a trade deficit actually increase the productivity of an economy? by importing goods for short-term use
by causing people to save
by building up a large amount owed
by importing investment goods used for capital deepening

Donald is studying the eating habits of all students attending his school. he samples the population by dividing the students into groups by grade level and randomly selecting a proportionate number of students from each group. he then collects data from the sample. which type of sampling is used? select the correct answer below: systematic sampling convenience sampling stratified sampling cluster sampling