To illustrate these assumptions, let us consider a simple numerical example. Suppose a car is needed for three years; that is, suppose N = 3. At the beginning of the first year, we have a 2-year-old car. The annual cost of operating a car is a function of its age; and this cost function is given by: c(0) = 10, c(1) = 20, c(2) = 40, c(3) = 60, and c(4) = 70. The fact that these costs are increas...

Community EyE HEaltH Journal | Vol 23 iSSuE 73 | SEPtEmBEr 2010 In many lowand middle-income countries, it is often the people who are poor or with a disability – or both – who find it most challenging to access and pay for health care. When people do come to us for eye care, it is therefore vital that we provide quality services efficiently and effectively. To achieve this goal, we must ensure...