| http://www.w3.org/ns/prov#value | - Estimating the cost of raising a child confronts a student with all sorts of systemic problems of cost estimation, including issues of joint costing, indirect costing, fixed costs that vary outside the period of time over which fixed costs supposedly remain fixed, sunk costs, time value of money, nonlinear costs, contingency costing such as health and provisions for handicaps, estimation error suc
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