Warren Buffett, chief executive officer of Berkshire Hathaway Inc., Anthony Crescenzi, executive vice president and strategist at Pacific Investment Management Co., and Ethan Harris, head of developed-markets economic research at Bank of America Merrill Lynch, offer their views on the U.S. employment report for June and the outlook for the labor market and economy.   This report also contains comments from John Silvia, chief economist at Wells Fargo Securities LLC; Maury Harris, chief economist at UBS Securities LLC; Scott Brown, chief economist at Raymond James & Associates Inc.; Edward Lazear, a professor at Stanford University and former economic adviser to President George W. Bush, and David Blanchflower, a professor at Dartmouth College and Bloomberg Television contributing editor.