I have some info that might help you there. Cost of living in Chile is fairly high, especially in Santiago. I live in Temuco, which is about 250,000 people. Cost of living here is cheaper than the US, but higher than other Latin American countries.
Regarding the job, it may be hard at first if you don't speak Spanish, although as an educated foreigner you do have an advantage, and regarding your studies, marketing is a huge area that Chile has been importing ideas from other developed countries.
I myself abandoned trying to find work in Chile, and am working for an American company through the internet, which pays better than anything I could find here. The one job that seems to pay well for English speakers is teaching English, but I'm not sure if that's what you are looking for.