Characterisation of quasiconcave functions

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Answer each of the following questions 'yes' or 'no', and justify your answer.

(a) Suppose f(x) is an increasing function of one variable. Is f(x) quasiconcave?

(b) Suppose f(x) is a decreasing function of one variable. Is f(x)quasiconcave?

(c) Suppose f(x) is a function of one variable and there is a real number b such that f(x) is decreasing on the interval (-∞,b] and increasing on [b,+∞). Is f(x) quasiconcave?

(d) Suppose f(x) is a function of one variable and there is a real number b such that f(x) is increasing on the interval (-∞,b] and decreasing on [b,+∞). Is f(x) quasiconcave?

(e) You should now be able to come up with a characterisation of quasiconcave functions of one variable involving the words 'increasing' and 'decreasing'.

Reference no: EM133240849

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