Here is apart of an Article from the AP were Castro admits the economic model of Communism doesn't work:
"Fidel Castro told a visiting American journalist that Cuba's communist economic model doesn't work, a rare comment on domestic affairs from a man who has conspicuously steered clear of local issues since stepping down four years ago.
The fact that things are not working efficiently on this cash-strapped Caribbean island is hardly news. Fidel's brother Raul, the country's president, has said the same thing repeatedly. But the blunt assessment by the father of Cuba's 1959 revolution is sure to raise eyebrows.
Jeffrey Goldberg, a national correspondent for The Atlantic magazine, asked if Cuba's economic system was still worth exporting to other countries, and Castro replied: "The Cuban model doesn't even work for us anymore" Goldberg wrote Wednesday in a post on his Atlantic blog.
He said Castro made the comment casually over lunch following a long talk about the Middle East, and did not elaborate. The Cuban government had no immediate comment on Goldberg's account"