AP Question of the week:

Refer to the graph to answer the questions that follow:

1. The graph above shows the short-run costs faced by a firm in a perfectly competitive industry. Identify the cost curves that are denoted by each of the following:
   1. Curve 1
   2. Curve 2
   3. Curve 3
2. Explain why Curve 1 intersects Curves 2 and 3 at the precise points that it does.
3. Identify and explain the economic “law” that determines and HOW it determines the shape of Curve 1.
4. At which price(s) would this firm be earning economic profits when producing at quantity Q1? Explain.
5. At which price(s) would this firm shut down when producing at Q1? Explain

IB Question of the week:

1. Explain how, in theory, a flexible exchange rate system should lead to the automatic stabilization of a nation’s current account balance. Use supply and demand diagrams to illustrate your answer
2. Referencing the Marshal Lerner Condition, explain the possible effects of a depreciation of a nation’s currency on its current account balance.

About the author: Jason Welker is a teacher at Zurich International School in Switzerland, where he teaches Advanced Placement and International Baccalaureate Economics. Jason was an international school student in Malaysia before studying economics at Seattle University then earning his Masters in Education. He calls Seattle and Northern Idaho home. In addition to maintaining an economics wiki and this blog for economics student and educators, Jason also gives presentations on using Web 2.0 tools in education at workshops and conferences around the world. His economics wiki won the 2007 "Best Educational Wiki" award from the "EduBlog Awards".

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