The two horsemen of this particular apocalypse—the external deficit and the swift rise of Central Bank credit—would have made 1988 a bad year no matter what else happened. But President García guaranteed financial disaster by his totally unexpected decision in July 1987 to nationalize the banks not already under government ownership. No one has yet been able to explain why he decided to do so. It would not seem to have been a move necessary for any component of his program, or needed for government control in a banking sector in which it already had a dominant position. In any case, the action underlined the unilateral character of economic policy action under Peru's presidential system and wrecked any possibilities of further cooperation with private sector leadership. Private investment began to fall, and the whole economy followed it down shortly thereafter.