Let us assume they start dumping all their excess internationally. Do you think other countries will just allow china to flood the international market and drive other countries respective auto makers out of business? Other countries will raise tariffs accordingly until they reach an equilibrium that they feel comfortable with.
>>almata+(OP)
Not everyone makes cars. Shrinking the global market shares of the ones that do will make the competitors' economy of scale worse as they withdraw from the ROW to hide behind the trade barriers.