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In our union , we vote for a president , we vote for a vice-president , we vote for all the executive positions , we vote for our shop stewards , all through a democratic process . Thus , the expected net present value of a seismic rehabilitation project is the sum of the present value of net benefits expected to accrue each year over the life of the project , minus the net costs of the rehabilitation project . This simple inversion leads to a change in surface representation that is more complex than a simple reversal in the depth ordering of the perceptual units ( as schematized in Fig. 86.3B ) . As a poor , recently democratised developing country , South Africa is extremely jealous of her sovereignty . To count fully the benefits of a seismic rehabilitation , the expected benefits of avoiding damages from the full range of damaging earthquakes must be counted , rather than simply considering one scenario or design earthquake . There is not too much that we do not vote on , and it is all done through a democratic process . Like any business , a healthcare organization must be able to react quickly to changing circumstances to succeed in a consumer-driven marketplace .