Turns out that billionaire investor Warren Buffett doesn\u2019t love Modern Monetary Theory either. \u201cI\u2019m not a fan of MMT - not at all,\u201d the Berkshire Hathaway Inc. chief executive officer said Friday in a telephone interview, adding that the deficit spending that\u2019s part of the theory could risk \u201cspiraling\u201d inflation. \u201cWe don\u2019t need to get into danger zones, and we don\u2019t know precisely where they are.\u201d Buffett joins critics including Federal Reserve Chairman Jerome Powell, former U.S. Treasury Secretary Larry Summers, BlackRock Inc. CEO Larry Fink and DoubleLine Capital\u2019s Jeffrey Gundlach, who called MMT \u201ccomplete nonsense\u201d that\u2019s being used to justify a \u201cmassive socialist program.\u201d Powell has said the concept of MMT is \u201cjust wrong.\u201d The main argument of MMT is that any country that prints its own currency can\u2019t go broke, so a country like the U.S. has a lot more room to deficit spend than normally thought, especially given low interest rates. Adherents include progressive Congresswoman Alexandria Ocasio-Cortez, who has floated increased deficit spending to address climate change. Buffett has criticized the fight over a debt ceiling, saying in 2011 that not raising the limit would be \u201casinine.\u201d He reiterated that view Friday, contending that it\u2019s a mistake to fight over the ceiling. \u201cIt\u2019s just ridiculous to be able to use the debt ceiling as a weapon in terms of other fights,\u201d Buffett said Friday. \u201cThe problem with having a debt ceiling is that it can be used for extraordinary mischief or, in effect, the blocking of government.\u201d Still, he stressed reason. It would be unwise to have the ratio of debt to gross domestic product grow consistently, he said.