As an example, constructing roads will have limited effects on growth until and unless some road networks are developed. For instance, in the case of the Internet, the greater the number of Internet users, the greater the possibility of providing various online services. But different infrastructure investments also exhibit network effects between themselves, because achieving economies of scale in infrastructure provision is often not just a case of providing for one kind of infrastructure but also entails complementarities between several other kinds of infrastructure investments (Agenor, 2010, Jiwattanakulpaisam et al., For example, energy to promote production in rural areas would not necessarily lead to an increase in the rate of return to enterprises in the absence of other investments, such as roads or telecommunications. Thus, the recent large-scale electricity roll-out in Rwanda did not seem to have a laige impact on micro-enterprises because of additional obstacles, such as inadequate transport links, that limit their expansion (Lenzetal.,