Producers are no longer in charge. User-Innovators are taking the lead and modifying products to fit their needs, filling in gaps that producers couldn’t see.This MIT Sloan article looks at what companies can learn from niche user-innovator communities, and how they can become an opportunity for reaching hidden markets. It’s not just tech companies that can benefit from embracing an open-source mindset. Welcoming user-innovation can transform offline brands and lives too.