미시경제학에서 comparative-static analysis를 할 때 shortcut으로 사용되는 envelope theorem이 과점시장(duopoly) 분석에서도 적용되나요?
*comparative-static analysis: comparison of different equilibrium states that are associated with different sets of values of parameters and exogenous variables.
- Chiang A. (1984). Fundamental methods of mathematical economics, McGraw-Hill.