These problems must be addressed by proper planning of cities and their public and private services, taking into account how people use their time so that these cities can continue to prosper and grow, and to make better use of resources and reduce pollution, poverty and inequality, and socioterritorial division. Sample designs should help to make inferences about geographical areas of interest, which could require financial resources for data production by municipalities, provinces or States. Nonetheless, once the necessary resources are available to prepare national surveys, the cost of expanding the samples to guarantee representativeness is usually not high.