TY - JOUR AU - Caballero,Ricardo J. TI - Aggregate Investment JF - National Bureau of Economic Research Working Paper Series VL - No. 6264 PY - 1997 Y2 - November 1997 UR - http://www.nber.org/papers/w6264 L1 - http://www.nber.org/papers/w6264.pdf N1 - Author contact info: Ricardo J. Caballero MIT Department of Economics Room E52-373a Cambridge, MA 02142-1347 Tel: 617/253-0489 Fax: 617/253-6915 E-Mail: caball@mit.edu AB - The 90s have witnessed a revival in economists' interest and hope of explaining" aggregate and microeconomic investment behavior. New theories, better econometric" procedures, and more detailed panel data sets are behind this movement. Much of the progress" has occurred at the level of microeconomic theories and evidence; however aggregation and general equilibrium aspects of the investment problem also has been significant. " The concept of sunk costs is at the center of modern theories. The implications of these costs for" investment go well beyond the neoclassical response to the irreversible-technological friction" they represent, for they can also lead to first order inefficiencies when interacting with" informational and contractual problems. ER -