The most likely cause of the following change in the FEM is:

Real Output Wage Wo Short-run Production Function NDemand' NDemand No N (labor) N(labor) No PANELB PANELA Savings New Savings Curve Real Interest Rate Interest rate ? New Investment Function Old Investment Function SAVINGS AND INVESTMENT PANEL CMC ATC Price and costs (dollars per unit) MR D 20 40 60 80 100 120 Quantity (units per day)