Granted by view is limited, but I'd assume companies are allowed to get massive in the UK, France, Germany, Italy, Japan and elsewhere too. What these countries

Granted by view is limited, but I'd assume companies are allowed to get massive in the UK, France, Germany, Italy, Japan and elsewhere too. What these countries lack is a large domestic market - with Japan the second largest, and Japan the second largest economy for most of the 20th century after WWII. The UK was large when it had the empire as a domestic market.