The proposal was made toward the end of a 2½ hour speech in which the Cuban leader forcefully backed a laundry list of changes to the country's socialist economic system, including the eventual elimination of ration books and other subsidies, the decentralization of the island nation's economy and a new reliance on supply and demand in some sectors.

Still, he drew a line in the Caribbean sand as to which reforms should remain, telling party luminaries that he had rejected dozens of suggested reforms that would have allowed the concentration of property in private hands.

Castro said the country had ignored its problems for too long, and made clear Cuba had to make tough decisions if it wanted to survive.

"No country or person can spend more than they have," he said. "Two plus two is four. Never five, much less six or seven - as we have sometimes pretended."