{ "cells": [ { "cell_type": "markdown", "metadata": {}, "source": [ "## Solow Growth Model: What If _s_ is the Net Rather than the Gross Savings Rate? \n", "\n", "Last edited: 2019-08-17\n", "\n", "Definition of capital-output ratio:\n", "\n", ">(1) $ κ_t = \\frac{K_t}{Y_t} $\n", "\n", "Factor accumulation:\n", "\n", ">(2) $ \\frac{dL_t}{dt} = nL_t $\n", "\n", ">(3) $ \\frac{dE_t}{dt} = gE_t $\n", "\n", ">(4) $ \\frac{dK_t}{dt} = s(Y_t - \\delta K_t) $\n", "\n", ">(5) $ \\frac{dK_t}{dt} = s(1 - \\delta κ_t)Y_t $\n", "\n", "Production function:\n", "\n", ">(6) $ Y_t = K_t^α(L_tE_t)^{(1-α)} $\n", "\n", ">(7) $ Y_t = κ_t^{(α/(1-α))}L_tE_t $\n", "\n", ">(8) $ κ^* = \\frac{s(1 - \\delta κ^*)}{n+g} $\n", "\n", ">(9) $ κ^* + \\delta κ^* \\frac{s}{n+g} = \\frac{s}{n+g} $\n", "\n", ">(10) $ κ^* \\left( \\frac{n + g + \\delta s}{n+g} \\right) = \\frac{s}{n+g} $\n", "\n", ">(11) $ κ^* = \\frac{s}{n+g + \\delta s} $\n", "\n", ">(12) $ Y^*_t = \\left( \\frac{s}{n+g + \\delta s} \\right)^{(α/(1-α))}L_tE_t $\n", "\n", "> (13) $ \\ln(Y^*_t) = (α/(1-α)) \\left( \\ln(s) - \\ln(n+g+\\delta s) \\right) + \\ln(E_t) + \\ln(L_t) $\n", "\n", "> (13) $ \\ln(Y^{*net}_t) = (α/(1-α)) \\left( \\ln(s) - \\ln(n+g+\\delta s) \\right) + \\ln(E_t) + \\ln(L_t) + \\ln(n+g) - \\ln(n+g+\\delta s)) $\n", "\n", ">(14) $ Y^{*net}_t = \\left( \\frac{n + g}{n+g+\\delta s} \\right) \\left( \\frac{s}{n+g + \\delta s} \\right)^{(α/(1-α))}L_tE_t $\n", "\n", " \n", "\n", "----" ] }, { "cell_type": "markdown", "metadata": {}, "source": [ " \n", "\n", "## Solow Growth Model: What If $ s $ is the Net Rather than the Gross Savings Rate?\n", "\n", "\n", "\n", "### Catch Our Breath—Further Notes:\n", "\n", "
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