A story about trick-or-treating on Halloween includes a comment from Charo Hulleza, managing director of Wayne State\'s Center for Urban Studies. She said the choice to trick or treat in affluent subdivisions where houses are close together is a market-driven choice. \"There is a perceived opportunity of maximum benefit from minimum effort,\" Hulleza said. \"And you will see parents from all sorts of communities facilitating this by driving (their children) around.\"