Ultimately, the metamorphosis of construction into an eco-service industry depends upon fundamental market changes that would build full costs into market prices. Prices for virgin materials have to increase substantially, especially compared to labour costs and the costs of reused or reclaimed materials. Fully internalized transport costs would encourage greater use of local materials, and help undercut the power of the big box chains. For this price revolution to happen, conscious government action will certainly be necessaryin the area of taxes, subsidies and producer liability that can make prices tell the ecological truth. (In the next chapter, I will touch more explicitly on these policy actions.) As important as these regulatory actions are, however, there will probably have to be a maturation of grassroots pressureand grassroots enterprise to make these rule changes possible. Despite their small numbers, the pattern for future retailing may be set by the allgreen retailers in Colorado and Oregon that are combining new green product sales with used building material retailing, consulting and education. I believe this constitutes two key new dimensions of building materials retailing: (1) that of making building centres into used material depots, and (2) that of making retail stores into information and learning centres. Used building material retailing is a natural fit for building supply outlets. If industrial economies are to make the transition to sustainability, the rapidly growing