"... In 2010, with the U.S. economy still wounded and U.S. consumers still wary, cash-rich investors often looked west: All the big returns were in Singapore or Hong Kong or Silicon Valley, they said, so they put their money into hot social-media start-ups and emerging economies. ..."Buffet buys into (relatively) 'fuel efficient' bulk transport system, trains. Is the sudden increase in startup funding explained here?