Investments in infrastructure - such as roads - typically aim to reduce transport costs, stimulate trade and make new production activities viable. Across sub-Saharan Africa, the need for such investments is widely acknowledged.
The argument for more and better infrastructure seems fairly compelling. But little rigorous evidence has been collected about the magnitude of the economic impacts from such new investments. In part, this is because new investments often respond to new activities, such as growing cities, and are not necessarily independent causes of that growth.
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