According to the environmental Kuznets curve, environmental pollution levels are typically lower in ________ countries, while those are typically higher in ________ countries.Which of the following statements is true regarding outsourcing of auto manufacturing between the U.S. and Mexico? American firms produce parts or products in Mexico to sell in the international market Maquiladoras have been built in the U.S. along the U.S.-Mexico border Hourly wage gaps are large enough for American firms to make profit by relocating their factories to Mexico American firms tend to hire Mexicans in the U.S. because their wages are cheaper than those for U.S. citizens