The formula for today's consumption is defined as:

$$C = Y - T -S^P $$

That being said the consumption of tomorrow is:

$$C' = Y' - T' + S^P(1+r)$$

Could anyone possibly explain to me why the saving becomes positive in tomorrow's consumption formula?

Thank you very much for your help

  • $\begingroup$ As an economist, I do not like this phrase, but "a penny saved is a penny earned." $\endgroup$
    – Giskard
    May 21, 2019 at 20:44
  • $\begingroup$ Thank you for your quick reply, so $𝑆𝑃(1+𝑟)$ is the amount saved today (if this is the case how come)? $\endgroup$
    – Fozoro
    May 21, 2019 at 20:46
  • 2
    $\begingroup$ Do these formulae relate to a 2-period model (in which there is no point in saving in period 2)? If there are more than 2 periods then one might expect $C' = Y' - T' + S^P(1+r) - S'$. $\endgroup$ May 21, 2019 at 21:29


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