U.S. and Canadian plans to spend more than $1.1-trillion (U.S.) on infrastructure are unlikely to be lucrative enough to attract big global investors, according to one of the world’s biggest funds in the sector. The amount of red tape involved, modest equity required and small returns investors will see from the sort of public-private partnerships being proposed will act as a deterrent for the world’s largest investors, said Sam Pollock, head of Brookfield Asset Management Inc.’s infrastructure group.