500
To some this sounds heartless. But in reality, it’s just a way of trying to measure the expense and advantages of any suggested partial solution. While it is typically easy to find the cost of each approach (providing clean drinking water means spending money on piping, drilling, maintenance, etc.), it is often harder to measure the benefits in monetary terms (less sickness, more comfort, better hygiene, better productivity, societal consequences from less sickness, etc.). However, economists have worked hard to put prices on many of these outcomes, based on individual behavior (our own implicit valuation) or social behavior (society’s implicit valuation). If we are to make meaningful comparisons between the vast array of different solutions to the world’s many woes, measuring costs and benefits seems to be an efficient and transparent way to convey crucial information about these issues.
Measuring costs and benefits will be helpful to communicate important information about the problems.