In: Economics
a. As profit maximising condition in perfect competition
is MR=MC where MR is the marginal revenue and MC is the marginal
cost. Now as long as Marginal revenue generated from selling an
additional unit is greater than the marginal cost that firm incurs
by selling an additional unit, the firm should expand production to
keep on earning positive profit. Whenever MR becomes equal to MC,
it gives a signal that increasing production beyond this level will
cause Marginal cost to be greater than marginal revenue and firms
start facing economic losses.