What type of decisions could someone make from the horizontal analysis

The prebisch–singer hypothesis concludes that: a. technology lowers the cost of manufactured products, so developing countries should see an increase in their terms of trade. b. developing countries experience a long-run decline in their terms of trade, as the demand for primary products in higher-income countries declines relative to their demand for manufactured goods. c. because of unfair trading practices, labor in developing countries is exploited. d. opec has been responsible for a slowdown in the world's standard of living.

Alarge tank is filled to capacity with 500 gallons of pure water. brine containing 2 pounds of salt per gallon is pumped into the tank at a rate of 5 gal/min. the well-mixed solution is pumped out at the same rate. find the number a(t) of pounds of salt in the tank at time t.

Which of the following is correct? a. a tax burden falls more heavily on the side of the market that is more elastic.b. a tax burden falls more heavily on the side of the market that is less elastic.c. a tax burden falls more heavily on the side of the market that is closer to unit elastic.d. a tax burden is distributed independently of the relative elasticities of supply and demand.