While there are clearly many complexities of the infrastructure fund sector that could fill numerous academic publications, we have picked out some of the various approaches and features that are most commonly discussed, namely:
• open-ended vs. close-ended funds,
• primary vs. secondary or follow-on funds,
• seed assets, and
Figure 7: Average fund size by region, 2004-08

Source: Preqin, 2009.
Figure 8: Growth of infrastructure funds launched from January 2007 to June 2009

Source: Preqin, 2009.
Figure 9: Unlisted fund managers by number of funds launched

Source: Preqin, 2009.
• leverage or gearing of a fund.