Know-How Exchange : Branding

To state it quite simply, global brand awareness creates a greater perceived value due to the perception that the brand is attractive to a much more broad audience than a single country, state or city.

If a brand in known worldwide, consumers will perceive "it must be good if people all over the world are purchasing". It also strengthens the view of corporate stability. Global companies "must" have done something right to reach out to the world rather than a specific area.

I hope this helps!