Cash yields are driving investors into infrastructure and other real asset categories, despite lower expected returns powered by all that capital moving into the sector. Overall, the amount of capital raised by infrastructure funds has been rising steadily since 2011, with $67.7 billion raised in 2017, a 10-year high and up from $65 billion the year before, according to London-based alternative investment research firm Preqin Ltd. In the first five months of 2018, some $24 billion was raised, Preqin data show. What's more, infrastructure managers have a record amount of committed but uninvested capital — $152.3 billion as of Sept. 30, 2017.