This is even more important in light of climate change, which may require the establishment of adjusted regional and international building standards for infrastructure and hence the close collaboration across disciplines, such as technical engineering and scientific research. Given the long-term investment nature of infrastructure projects, they require stable and multi-layer governance structures - generally involving local, regional, national and international levels - and long-term financing. Private investment appears to be of growing importance, but potential governance problems such as infrastructure monopolies need to be considered. At the same time, the need for multiple actors, multiple-layered governance structures, and multi-disciplinary approaches may represent key barriers to infrastructure development in less-developed regions. For the most part, however, these effects are found to be rather small. Global average producer prices for crops would increase by less than 0.3% in 2050, and only in South Africa, where infrastructure-related costs for agricultural products are comparatively high (GTAP, 2013), could the increase exceed 1%.