Suppose that as the output of mobile phones increases, the cost of touch screens and other component parts decreases. If the mobile phone industry features pure competition, we would expect the...

Suppose that as the output of mobile phones increases, the cost of touch screens and other component parts decreases. If the mobile phone industry features pure competition, we would expect the long-run supply curve for mobile phones to be:

(a) Upward sloping.

(b) Downward sloping.

(c) U-shaped.

(d)Horizontal.

multiple choose question