Level 0 (0 marks): The work does not meet a standard described by the descriptors below.
Level 1 (1-2 marks): There is a correct diagram OR an accurate written response. For an AD/AS diagram with a LRAS (no AD or SRAS required) shifting to the right and an increase in potential (long-term) output O R for explaining that reducing the common external tariff would increase efficiency (productivity) by increasing competition (between firms) (and/or increase the quantity/quality of resources) and hence lead to an increase in potential (longterm) output (or LRAS).
Level 2 (3-4 marks): There is a correct diagram AND an accurate written response. For an AD/AS diagram with a LRAS (no AD or SRAS required) shifting to the right and an increase in potential (long-term) output AND for explaining that reducing the common external tariff would increase efficiency (productivity) by increasing competition (between firms) (and/or increase the quantity/quality of resources) and hence lead to an increase in potential (longterm) output (or LRAS).
Candidates who label diagrams incorrectly can be awarded a maximum of [3].
For AD/AS, the vertical axis may be Average (General) Price Level, or Price Level. The horizontal axis may be real output, real national output, real income, real national income, real GDP or real Y. Any abbreviation of the previous terms is acceptable. Alternatively, a Keynesian AS may be drawn with the vertical portion shifting to the right. A title is not necessary.