For this question, refer to Figure 1, which shows a production possibilities frontier for swordfish catch (a private good denoted by G), and sea turtle bycatch (a public bad denoted by B). G0 and B0 represent production before the performance standard is implemented, and G1 and B1 represent production after the performance standard.

Figure 1. Production Possibilities Frontier

Suppose swordfish catch were fixed at G0 both before and after the performance standard. By how much would the performance standard decrease sea turtle mortality?

Question

For this question, refer to Figure 1, which shows a production possibilities frontier for swordfish catch (a private good denoted by G), and sea turtle bycatch (a public bad denoted by B). G0 and B0 represent production before the performance standard is implemented, and G1 and B1 represent production after the performance standard.

Figure 1. Production Possibilities Frontier

Suppose swordfish catch were fixed at G0 both before and after the performance standard. By how much would the performance standard decrease sea turtle mortality?

BlackTom AI · Accepted Answer

1. Relevant knowledge points and concepts
Production possibilities frontiers (PPFs) show trade-offs between two outcomes: here G (private good: swordfish catch, vertical axis) and B (public bad: sea turtle bycatch, horizontal axis). A performance standard shifts the feasible frontier outward or changes technology so that for the same level of G you can achieve a lower level of B. Fixing G at G0 means we compare the horizontal line at G0 before and after the standard to read off the corresponding B values.

2. Step‑by‑step reasoning
- Fix swordfish catch at G0 both before and after the standard: follow the horizontal dashed line labeled G0 across the graph.
- Where that G0 line meets the production frontier before the standard is the point associated with sea turtle bycatch B0 (point E on the pre‑standard PPF).
- Where the same G0 line meets the new frontier after the performance standard is the point associated with lower sea turtle bycatch B1 (point D on the post‑standard PPF).
- The reduction in sea turtle mortality is the change in B when G is held at G0: it falls from B0 down to B1.

3. Intermediate steps / visual "calculation"
- Initial sea turtle mortality at G0 = B0.
- Final sea turtle mortality at G0 after standard = B1.
- Change (decrease) = initial − final = B0 − B1, i.e., the mortality moves from B0 to B1.

4. Why the correct answer is correct
Because the question fixes G at G0, the only relevant movement is along that G0 horizontal line. The PPF after the standard lies inside/closer to the origin for B at that G level, so sea turtle bycatch falls from B0 to B1. That is exactly the change labeled B0 to B1.

5. Why the other options are incorrect
- "0 to B1" and "0 to B0" imply initial sea turtle mortality was zero, which contradicts the graph showing positive B0 initially.  
- "G0 to G1" refers to a change in swordfish catch (G), but G is fixed at G0 by the problem statement.  
- "E to F" references specific points that do not represent the before/after B values at the fixed G0 (E is the pre‑standard point at G0 but F is at G1, so E to F is not the correct comparison).

6. Conclusion
Therefore the performance standard decreases sea turtle mortality from B0 to B1, matching the provided answer "B0 to B1."

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