In their "Unhappy Cities" paper, Edward Glaeser, Joshua Gottlieb and Oren Ziv examined the self-reported subjective well-being of people living in American metropolitan areas, particularly in relation to the notion that "individuals make trade-offs among competing objectives, including but not limited to happiness." The researchers findings revealed that people living in metropolitan areas where lower levels of happiness are reported are receiving higher real wages, and they suggest in their conclusion that "humans are quite understandably willing to sacrifice both happiness and life satisfaction if the price is right."