Stachybotrys chartarum (atra) is the black mold that has most been associated with media reports on the toxic effects of fungal exposure. It prefers gypsum wall board as a substrate and requires very high relative humidity levels to grow. Stachybotrys chartarum is known to produce the mycotoxin, satratoxin.
When total utility is rising with the increased consumption of a good, but is rising at a decreasing rate, marginal utility is negative. b. When total utility is rising with the increased consumption of a good, and is rising at an increasing rate, marginal utility is positive. c. At the maximum point of a hill-shaped total utility curve, marginal utility is infinite. d. When total utility is falling with the increased consumption of a good, but is falling at a decreasing rate, marginal utility is positive.
Utility measures the benefits (or drawbacks) from consuming a good or service or from working, and although utility is not directly measurable, it can be inferred from the decisions that people make. In economics, marginal utility is usually described by a function, such as the exponential utility function. In measuring the utility of a certain good, service, or labor, economics use either expected or indirect utility to express the amount of pleasure from consuming or purchasing an object.