Investment magnate Warren Buffett has warned against weaponizing commerce as U.S. President Donald Trump's "reciprocal tariffs" bear down on world trade. In a 2003 Fortune magazine article, he warned about trade deficits using his Thriftville versus Squanderville parable. He proposed using "import certificates" to balance trade. Now, as tensions rise, could his old idea help fix today's crisis? Duke Kunshan University's John Quelch weighs in.