Unless Trump can stop them, Toyota will move much of their current U.S. manufacturing to Mexico.
Toyota has huge plans for Mexico.
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One big factor here may be Mexico's status as a TPP signatory. If Mexico is part of a multi-nation trade bloc with Japan and the U.S. is not, then it would make sense for a Japanese company to strongly consider new operations there.
No one minds if Toyota has big plans for Mexico as long as their plans don’t included selling cars made in Mexico in the U.S. But Toyota’s problem with selling new vehicles in Latin America stems from a Japanese policy that encourages the sale of older cars.
It becomes financially unwise to keep an older car in Japan. After five years the cost of renewing your registration goes up, mainly because of more expensive “safety inspections”. It simply becomes cheaper to buy a new car. So what happens to the older cars? They get shipped to Latin America and other third-world countries. Because Japanese cars are built to last, people in Latin America can very good deals on generally well-maintained five-year-old cars. Toyota does sell new cars in Latin America, but they (and other Japanese brands) have to compete against older cars imported from Japan.