Says negative interest rates are a powerful force.
Buffett was asked about the appreciation of the US dollar and if he were surprised by its strength, he referred to the cost of his businesses due to negative interest rates.
He also touched on comments he made last week when he said Greece leaving the euro 'may not be a bad thing' and that it's 'not ordained' that the Eurozone has a fixed number of members. He added that Germany won't fund Greece forever and noted that he doesn't have 'a dime' but on whether Greece will leave the Eurozone.
Warren sees problems in Europe.
