Achieving sustainable growth in business involves a scientific approach, focusing on both paid and organic growth, with a strong emphasis on the latter to ensure long-term success. Andrew Chan from Andreessen Horowitz suggests that 70% of user acquisition should be organic due to the increasing costs associated with paid growth. Virality, a key component of organic growth, involves specific elements identified by Jonah Berger and others, such as social currency, triggers, emotional impact, visibility, practical value, stories, flawless performance, and shareability. These elements contribute to a product's virality index, which measures its potential to grow through word-of-mouth and organic means. Companies like Datagran utilize this index to compare different products' virality, illustrating how incorporating these elements can lead to sustainable growth.