WEBVTT

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V posledním videu jsme se začali zabývat

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"spotřební funkcí".

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Je to vcelku jednoznačné.

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Tato funkce popisuje

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jak celkový přijem ovlivňuje
celkovou spotřebu.

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Začali jsme s jednoduchým modelem,

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s prostou spotřební funkcí.

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Lineární funkcí.

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Měli jste nějákou základní
úroveň spotřeby,

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bez ohledu na celkový příjem

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a potom jste měli nějakou spotřebu,

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která byla dána nějakým

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disponibilním příjmem.

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Pokud to zakreslíme,
dostaneme přímku.

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Mám tady přímku.

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V tom videu jsem upozornil,

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že to není jediný způsob,

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jak popsat spořební funkci.

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Mohli byste použít hezčí 
matematické pomůcky.

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Možná dokáže sestrojit
spotřební funkci.

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Můžete podoknout.

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Můžete podotknout, že "mezní sklon


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ke spotřebě" je větší při nizších úrovních

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disponibilního příjmu, 
ten klesá

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acelkový disponibilní přijem

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když celkový disponibilní 
příjem roste.

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Možná si řeknete, že bychom


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si mohli vzít hezčí spotřební funkci,

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která by graficky vypadala takto

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a potom byste museli použít

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hezčí čísla, než jsme použili tady.

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V tomto videu bych se rád

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zaměřil na lineární model.

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Ten důvod je jediný,

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je to jednodušší.

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Lépe se s tím pracuje.

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Je to model, který lidé používají,

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když se seznamují

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se spotřeební funkcí

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a následně na to navazující látku,

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kterou uvidíte v tomto videu,

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"keynesiánský kříž".

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Co teď udělám jsou dvě věci.

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Udělám tuto spotřební funkci obecnou.

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napíšu to tak,

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aby to nebyla funkce pouze 
dosponibilního příjmu,

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ani celkovového disponibilního příjmu,

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který jste viděli v posledním videu,

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ale jako funkce příjmu,
celkového příjmu.

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