In this VentureBeat article which embeds the Goldman Sachs "Map of IoT Smart Things", you can skip the first 5 over-hyped Internet of Things markets and go right to the real market potential: #6 Industrial.
Here's a quote:
[A] big potential market covering
The first 5 markets that the article lists (People, Vehicle, Homes, Towns, & Commerce) are just gimicky, over-hyped IoT areas that might wind up saving a few dollars here and there for some set of ill-defined segments, but it is the Industrial market (#6) where IoT technology will enable companies to _make_ more money, not just save money. And, that's an important distinction.
That's the key for IoT, is to apply IoT technology and continuous analysis to areas that will produce more products, increase efficiency, and drive more revenue, which will generate more profits. Saving money is finite. Making money is infinite. What better place than the factory floor or in the warehouse to make money off of IoT devices and data analysis. That's where the IoT money will be. Cha-ching.