addle-point. A point on a multivariable function that is neither a maximum nor a minimum, but is where the value of the function does not change with small changes in the values of the choice variables. “Safe Harbor” policy. An agreement in the USA under which nonfederal landowners can restore, enhance, or maintain habitats for endangered species with the assurance that additional restrictions will not be placed upon them if endangered species either appear on the land or populations increase. safe minimum standard. An approach to resource management that tries to reduce the probability of potentially high cost or losses by ensuring the level of exploitation is such that the population does not fall below a safe minirnumstandard. See precautionary principle. FURTHER READlNG Ciriacy-Wantrup (1952). Sahara desert. The desert region in north Africa that stretches from the Atlantic ocean to the Red Sea. Sahel. An arid area in western Africa, south of the Sahara desert, which encompasses (from west to east) Senegal, Mauretania, Mali, Burkina Faso and Chad. sales tax. Tax levied as a percentage of the retail sales price of a good or service. salinity. The proportion of dissolved salts in water. Water with salinity levels in excess of 500 parts per million (ppm) is unsuitable for domestic use and salinity levels in excess of 2,000 ppm makes the water unsuitable for irrigation purposes. Excess salinity in soils can be a major agricultural problem, especially in poorly drained soils. A major cause of excess salinity in soils is...
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