| Notation | Definition | Notation | Definition |
| D | Activity level for domestic production | M | Activity level for import |
| INV | Activity level for investment | Z | Activity level for aggregate consumption |
| YT | Activity level for international transport | W | Activity level for welfare |
| HTRN | Activity level for aggregate household transport | GOVT | Activity level: total government expenditure |
| EID | Activity level for energy input (w/ CO2 penalty) | RA | Income of the representative consumer |
| A | Activity level for Armington good production |
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