Buffett, mum on a successor, dreams of 'elephant-sized' acquisition

Billionaire investor Warren Buffett has yet to name a successor and at age 88 still dreams of making an "elephant-sized" acquisition, he said in his annual letter to shareholders.The letter to shareholders of Buffett's holding company, Berkshire Hathaway, is considered a must-read on Wall Street, distilling the views of the "Oracle of Omaha" on the state of the economy and the wisdom of investing in this or that investment product."In the years ahead, we hope to move much of our excess liquidity