1st: conventional theory on domestic competition is that embracing international rivals. But the truth is that the absence and unqualify international companies. In many industries, there is only one national rival.
2nd: dynamic improvement is much more important. Domestic rivalry can spur as well. Unlike international rivalries, local one focus beyond pure economic or business competition. Domestic rivals engage in active feuds. And company doesn't have excuse for international rival's "unfair advancement".