Typically, the tied product may be a less desirable one that the buyer might not purchase unless required to do so, or may prefer to get from a different seller. If the seller offering the tied products has sufficient market power in the tying product, these arrangements can violate the antitrust laws.
In general, a hub refers to a hardware device that enables multiple devices or connections to be connected to a computer. An example is a USB hub, which allows multiple USB devices to be connected to one computer, even though that computer may only have a few USB connections. The picture to the right is an example of a USB hub. Note: In the Device Manager, the root hub is your computer and the first USB hub.
The USB Hub. USB hubs do for your computer what power cords do for your wall outlet. They have at least two or more USB ports, and one USB connector. The hubs connect to your computer through its USB port and automatically increase the number of devices that can be plugged into the computer at a single time.