Trade allows goods and services to move great distances from where they are produced to where they are consumed. It has allowed a decoupling of local endowments of natural capital, and production and consumption of goods and services that depend on those assets. As noted in Chapter 4 and 4*, achieving Impact Equality is a condition for global sustainability. But sustainable management of ecosystems at smaller scales remains of key concern. Imbalances between demands on ecosystems and their sustainable supply also occur, affected by where goods and services are consumed and produced, and flows of those goods and services, enabled by domestic and international trade. For example, it is unlikely, indeed near impossible, that a city would be able to meet the needs of its citizens with the ecosystems within its administrative boundary, but this is not necessary if the city can benefit from ecosystem services provided elsewhere.