The world also faces a serious investment problem, which the low cost of capital has done virtually nothing to overcome. Public-sector investment is now below the level needed to sustain robust growth, owing to its insufficient contribution to aggregate demand and productivity gains.
世界还面临严重的投资问题，降低资本成本对于这个问题几乎毫无用处。目前，公共部门投资低于维持强劲增长所需要的水平，因为其规模不足以产生足够的总需求和生产率的提高。