Salcia is a country that depends heavily on domestic products. The Salcian government decides on the products that can be imported and ensures that any product that can be produced at home is not imported. A major part of Salcia's trade is concentrated on exporting agricultural produce and textiles. Which of the following influences Salcia's approach to international trade?
A) Leontief's paradox
B) Product life-cycle theory
C) Neo-Ricardian trade theory
D) Mercantilism
E) New trade theory

You are the manager of a large crude-oil refinery. as part of the refining process, a certain heat exchanger (operated at high temperatures and with abrasive material flowing through it) must be replaced every year. the replacement and downtime cost in the first year is $165 comma 000. this cost is expected to increase due to inflation at a rate of 7% per year for six years (i. e. until the eoy 7), at which time this particular heat exchanger will no longer be needed. if the company's cost of capital is 15% per year, how much could you afford to spend for a higher quality heat exchanger so that these annual replacement and downtime costs could be eliminated?