It’s a common challenge for almost every startup: how much and how fast to grow. But Vijay Shekhar Sharma, founder of the Indian mobile payments and commerce platform Paytm, knows that he wants to take his company to $100 billion and replicate its model in other emerging markets. Harvard Business School professor Sunil Gupta discusses how reaching Sharma’s lofty goal won’t be about technology and finding new solutions, but rather all about finding new use cases for existing solutions.