Macroeconomics 11th Edition by Michael Parkin

Exercise 30

Use the following news clip to work the Problem.
Underwater Oil Discovery to Transform Brazil into a Major Exporter
A huge underwater oil field discovered late last year has the potential to transform Brazil into a sizable exporter. Fifty years ago, Petrobras was formed as a trading company to import oil to support Brazil's growing economy. Two years ago, Brazil reached its long-sought goal of energy self-sufficiency.
Describe Brazil's comparative advantage in producing oil and explain why its comparative advantage has changed.