A central assumption of quantity-quality trade-off models is that parental resources are finite (Becker and Lewis 1973; Lack 1947; Stearns 1992; Williams 1966).
They include: a database of prices for traded goods, a database listing the reported useful life of capital goods, a workbook listing activities used in programme costs together with assumptions of quantities of resources used based on the data collected by WHO, and a costing tool CostIt© to calculate and present the final results of the costing exercise.
Remember that, by definition, the estimated elasticities describe firms' optimal adjustments to their production processes under the assumption of constant output quantity.
Therefore, the assumption of a high quantity of red wine per day would be needed for a man to obtain a protective dose of resveratrol, causing serious health problems [ 7, 8].
Without any assumptions of small/large quantities, the corresponding non-linear partial differential equation with variable coefficients is transferred into an infinite number of linear ordinary differential equations with constant coefficients.
We can simulate the human health benefit of control in terms of the number of human brucellosis cases avoided under the assumption that the quantity of milk infected with Brucella and sold in urban Kampala has a linear relationship with incidence of human brucellosis in the same areas.
The relation between these numbers agrees well with the assumption that the quantity of transcription factors of an organism is correlated to the genome size and the environmental surrounding a bacterial cell is exposed to [ 9].
Indeed, these conclusions are often based on the assumption that the quantity of resources devoted to the production and maintenance of sexual traits should be the same across species [ 6, 45].
Increasingly though investigators are questioning the assumption that quantity confers the greatest risk and are adopting approaches which enable fuller examination of the configurations of CAs [ 12- 16].
In order to show the validity of this assumption, the quantity Gr ⋅ Pr is evaluated for Re = 5 × 103, 10 × 103 and 20 × 103 at z/D = 50, obtaining the following results: (approx).
To check the proportional hazards assumption of the models, interactions between quantity and variety of fruit, vegetables, and combined F&V intake and current age (i.e., the underlying timescale) were tested.
