A Malthusian Model of Population Change

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Presentation transcript:

A Malthusian Model of Population Change Thanks to Luis Locay for introducing me to this model many years ago.

Malthus: A Formal Model Ld=labor demand Labor (Pop.) Ls=labor supply Real Wage CBR CBR, CDR NRI=0 CDR Real Wage w*

Effects of Charity A Malthusian Perspective Growth shifts Ls curve up thus reducing the effective wage. Labor (Pop.) Ls2 3 Ls The effective wage falls until CBR=CDR, leaving the level of living as was prior to charity. Ld Real Wage CBR CBR, CDR CBR>CDR => Growth 2 Worker receives w*-c from labor and c in charity. CDR Real Wage (w*-c) w* (w*+c) 1 4

Malthus: The Plague Labor (Pop.) Real Wage CBR, CDR Real Wage w* w2* Ld Labor (Pop.) Ls 2 Ls2 Real Wage CBR, CDR CBR 1 CDR2 CDR Real Wage w* w2*

Technological Advances Ld Ld2 Labor (Pop.) 1 Ls2 4 Ls Real Wage CBR CBR, CDR 3 population grows NRI=0 CDR Real Wage w* w2 5: wage returns to w* 2

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