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RESEARCH PRODUCT

How green neighbourhoods make cities more compact?t? A 2D microeconomic perspective

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National audience; We analyse the emergence of scattered residential development, a key characteristic of sprawl. We analyse a 2D urban economic model with neighbourhood interactions among households (social contacts) and with farmers (who produce green amenities). Starting from a cross-shaped road network and CBD, we analytically establish the existence and characteristics of residential leapfrogging that breaks up the compact development of the city. We extend our analysis by numerical experiments based on observed or econometrically estimated parameters. We nd that the shape of built up areas in uences the decision or not to jump over undeveoped land or to stick to the contiguous urban footprint. We show that the shape and size of the neighbourhood where people interact and enjoy green amenities also plays a major role in that decision. We conclude that dependending on the urban contexts and forms, the spatial arrangement and size of the area where households take amenities may constitute a policy lever and the source of innovative anti-sprawl strategies.