In the context of climate change, what phenomenon does China's utility function capture? What does this exercise tell us about the limitations of the first welfare theorem? What do you think is an important aspect of trade in reality which is not captured by this model? Consider two countries, the US (U) and China (C) who enjoy two goods, smartphones xn and rice xr. Their preferences are represented by the following utility functions: uU=xsUxrUuC=xsCxrC2xsU.