Prime Minister Narendra Modi on Sunday said his target is to make India a $20 trillion economy, and to achieve that, the country has focus on three areas—agriculture, services and manufacturing. He was speaking at a townhall convened at Facebook Inc.’s headquarters in Menlo Park, California. Facebook CEO Mark Zuckerberg curated the talk where the prime minister fielded questions from the audience and a few of the 1.5 billion users of the social media website.