Long Run Market Supply

• In the Long-Run firm gets zero profit
• If the Long-Run, supply curve industry is perfectly elastic. The market is called Constant-cost Industry. It has means if output rises, so it does not effect input price.

2 Possible :

• Increasing-cost Industry

Cost structure rise because price of input rise with new firm entry to the market and existing firms expand the business. So, LR Supply Curve is positive.

• Decreasing-cost Industry

Cost structure decreased because the price of input decreased with output industry. So, LR Supplu is negative