When it comes to product research, demand is one of the most critical factors that you have to consider. Even the most innovative, aesthetically-pleasing product won’t sell like pancakes if there is no demand. Just take Apple products, like iPhone, for example. Months before a new iPhone is released, people talk about it on social media even before an initial prototype is shown. Because of the massive demand for the iPhone, people are willing to pay premium prices. High-demand products have massive hype around them. And when it comes to selling on Amazon, in-demand products can generate lots of sales…