▁nin ete enth ▁century ▁British ▁political ▁econom ist ▁Thomas ▁Mal th us ▁in ▁ 1 8 2 0 . ▁Mal th us ▁wrote ▁Princi ples ▁of ▁Political ▁Econom y ▁as ▁a ▁re but tal ▁to ▁David ▁Ric ardo ' s ▁On ▁the ▁Princi ples ▁of ▁Political ▁Econom y ▁and ▁Tax ation . ▁While ▁the ▁main ▁focus ▁of ▁their ▁work ▁is ▁to ▁explain ▁economic ▁de press ions ▁in ▁Europe ▁and ▁the ▁reasons ▁why ▁they ▁occur , ▁Mal th us ▁uses ▁his ▁scholar ship ▁to ▁explore ▁price ▁determ ination ▁and ▁the ▁value ▁of ▁goods . ▁ ▁Sum mary ▁of ▁Princi ples ▁of ▁Political ▁Econom y ▁ ▁In ▁Princi ples ▁of ▁Political ▁Econom y , ▁Mal th us ' ▁re but s ▁David ▁Ric ardo ' s ▁work , ▁particularly ▁reject ing ▁idea ▁developed ▁by ▁Jean ▁Bapt iste ▁Say ▁that ▁the or izes ▁that ▁supply ▁generates ▁its ▁own ▁demand , ▁known ▁as ▁Say ' s ▁Law . ▁Say ' s ▁Law ▁emphas izes ▁the ▁idea ▁that ▁there ▁is ▁no ▁t endency ▁towards ▁a ▁de pression ▁because ▁as ▁supply ▁increases , ▁people ▁will ▁naturally ▁demand ▁more . ▁Say ▁bel ieves ▁that ▁an ▁overflow ▁of ▁supply ▁of ▁certain ▁goods ▁will ▁trigger ▁a ▁lack ▁of ▁supply ▁of ▁another ▁type ▁of ▁good . ▁This ▁will ▁create ▁a ▁new ▁balance ▁in ▁the ▁economy . ▁Mal th us ▁claims ▁that ▁supply ▁does ▁not ▁generate ▁its ▁own ▁demand ▁and ▁that ▁o vers upp ly ▁can ▁lead ▁the ▁economy ▁to ▁re cess ion . ▁Mal th us ▁understand s ▁production ▁and ▁demand ▁to ▁exist