The most expensive U.S. cities are usually expensive for a reason. Residents pay higher living costs in exchange for favorable geography, climate, culture or economic prosperity — or all of the above. Of course, that doesn’t make the most expensive cities the “best” cities to live in, at least not for everyone, says Jennie Allison of the Center for Regional Economic Competitiveness, a nonprofit research and policy group. …. To determine just how much the most expensive U.S. cities cost, we turned to the latest data from the Council for Community and Economic Research. Its Cost of Living Index measures prices in 269 urban areas for housing, groceries, utilities, transportation, health care, and miscellaneous goods and services such as getting your hair done or going to a movie. Take a closer look at the 10 most expensive U.S. cities.