Image source: The Motley Fool.At Berkshire Hathaway's (NYSE: BRK-B) annual meeting earlier this month, an investor asked Warren Buffett about the company's shift from investing in high-return, asset-light businesses to capital-intensive businesses, such as railroad operator Burlington Northern. Whether this shift is actually occurring or not can be argued, but Buffett agreed with the questioner about the idea of investing in businesses that return gobs of capital with minimal investment.