8.2 A Simple Two-period Model o Debit consumption o Save for future consumption period2 period Q2 E A B C2 C2 Q2 Q1 C1 period 1 C1 Q1 riot 友学经济学院8.2 A Simple Two-period Model  Debit consumption  Save for future consumption period2 period1 Q2 Q1 C1 C2 Q2 C1 Q1 C2 period1 period2 E A B E