That sounds like an attractive proposition – but someone must make the initial investment in exchange for a claim to the later savings. (And, one way or another, the investor will need to repurpose the health-care facilities and workers to some other role, including prevention, serving outsiders, or conversion to another use entirely.)
假设不再每年花10亿美元，而是在第一年花12亿美元，但在（比如）第五年花7.5亿美元。这个方案看起来颇有吸引力——但必须有人出这笔初始投资，作为回报，他有权获得后来的储蓄。（此外，投资者需要以某种方式改变卫生设施与工作人员的用途和角色，包括预防、服务外来者或完全转变为新用途和角色。）