Hi guys,
I have had a problem with understanding long-run perfect competition. Wikipedia states that "Only normal profits arise in circumstances of perfect competition when long-run economic equilibrium is reached; there is no incentive for firms to either enter or leave the industry." This confuses me, as to my understanding when a firm makes a normal 'profit', it is actually just breaking-even in business profit terms. Surely, in that case, firms do have an incentive to leave the market - they are wasting their time by breaking-even and can easily, due to a lack of exit barriers under PC, turn to other industries/sectors where they can make a supernormal profit.
My only interpretation to make sense of this is that the 'long-run' never really exists in this already theoretical scenario; more firms enter the market in the short-run to make a supernormal profit, driving the market price (AR/MR) of the good being sold downwards, therefore tending towards but never reaching (or at least only reaching for a VERY short period of time) the ATC curve. However, surely firms will start to leave the market once the level of supernormal profit becomes unsatisfactory (or at least zero/non-existent), once again raising AR/MR.
Please could somebody help to clarify my confusion? Thank you!