Comparative studies (3) Reason (3) Flight (3) Analysis (3) Vuelo (3) Consumo (3) Consommation (3) Études comparatives (3) Vol (3) Consommation (3) vol (3) puits (2) papier (2) modèle (2) séparation des masses (physique) (2) analyse (2) débit (2) emploi (2) Dynamics (2) Employment (2) Paper (2) Insight (2) Households (2) Example (2) Equilibrium (2) Dynamics (2) Discussion (2) Business enterprises (2) Authors (2) Separation (2)