Suppose the demand for digital video recorders (dvrs) is given by q = 250 - .25 p + 4 pc, where q is the quantity of dvrs demanded (in 1000s), p is the price of a dvr, and pc is the price of cable television. how much of a change in p must occur for q to increase by one?

Δp = -4 units

Explanation:

For calculating how the quantity of DVRs demanded changes, when the price is modified in one unit, we calculate the derivative of Q with respect to p

This means that when the price increases in one unit the quantity of DVRr demanded reduces in 0.25 units. Then the price must be reduced in 4 units for to obtain one unit more demanded.

wavelength variability is the right one

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