(Bloomberg Markets) -- Money managers are navigating an historic shift: India’s ­population, at 1.43 billion, edged past China’s this year. Now the world’s most populous country, India could experience a decades-long investment boom. Goldman Sachs Group Inc. analysts expect its share of global equity market capitalization to quadruple between now and 2075—reaching 12%, when it will be neck and neck with China’s. (Over that same period, the US share is projected to drop by half, to 22%.) India and China both offer investors the chance to profit from rising powers’ economic growth.