Long Run Entry and Exit Decision: Videos & Practice Problems

In the context of market dynamics, firms make critical decisions regarding their participation based on profitability. A firm will exit a market if it consistently fails to earn a profit, indicating that remaining in the sector is not viable. This contrasts with a short-run shutdown, which is a temporary measure where a firm ceases production but may resume later. In the long run, however, an exit signifies a permanent decision to stop all operations in that market.

When evaluating the long-run exit decision, all costs become relevant, including both fixed and variable costs. In the short run, firms focus primarily on variable costs since fixed costs remain unchanged. However, in the long run, the concept of fixed costs shifts; they can be altered or eliminated as time allows for changes in operational commitments, such as leases on facilities. Thus, in the long run, firms can adjust all costs, leading to a scenario where they only remain in the market if they can cover all expenses and generate profit.

Ultimately, the absence of profit in the long run compels firms to exit the market entirely, as they can no longer justify their presence. This understanding of long-run exit decisions is crucial for analyzing market behavior and firm sustainability.

In the long run, a farmer faces a critical decision regarding whether to rent a field for \$1,000 for the upcoming season. Unlike the short run, where costs are already incurred, the farmer now has the option to choose whether to incur this cost. The cost of seeds remains at \$200, and the farmer must evaluate whether to produce or not based on potential revenues.

If the farmer decides not to produce, he incurs no costs, resulting in zero profit and zero loss. Conversely, if he chooses to produce, he generates revenue of \$500. However, with the total costs of renting the field (\$1,000) and seeds (\$200), his total costs amount to \$1,200. This results in a loss of \$700, calculated as:

Loss = Revenue - Total Cost = \$500 - \$1,200 = -\$700.

In this scenario, the best option is to refrain from production, as it avoids losses. If the revenue drops to \$100, the situation worsens. Again, if the farmer does not produce, he has no costs. If he produces, his revenue of \$100 against total costs of \$1,200 leads to a loss of \$1,100:

Loss = Revenue - Total Cost = \$100 - \$1,200 = -\$1,100.

Thus, the optimal decision remains not to produce, as he cannot cover his costs. This highlights the importance of understanding relevant costs in the long run, where all costs are considered. The farmer can exit the market if the price falls below the average total cost (ATC), which is crucial for long-term sustainability.

In the long run, the decision to exit the market is based on the relationship between total revenue and total cost. If total revenue is less than total cost, the farmer should exit. This can be expressed mathematically as:

Total Revenue < Total Cost.

When analyzing average values, average revenue (AR) is equivalent to price (P), leading to the conclusion that:

Exit if Price < Average Total Cost (ATC).

Conversely, if the price exceeds the average total cost, firms are incentivized to enter the market, as they can potentially earn profits. This relationship emphasizes that in the long run, the average total cost curve is the critical factor for decision-making, unlike the average variable cost curve, which is more relevant in the short run.

In summary, the long-run decision-making process for the farmer revolves around the ability to cover total costs with total revenues, guiding whether to produce or exit the market based on the average total cost.

Understanding long-run exit decisions in a market involves analyzing cost curves, price levels, and profit outcomes. The key cost curves to consider are marginal cost (MC), average total cost (ATC), and average variable cost (AVC). The price levels, denoted as P1 through P5, help illustrate different scenarios for short-run and long-run production decisions.

Starting with a high price level, P1, which is above both AVC and ATC, firms will produce in the short run since they can cover their average variable costs. In this scenario, they also earn a profit because the price exceeds the average total cost. The profit can be calculated as the area of the rectangle formed by the difference between price and ATC multiplied by the quantity produced.

At the next price level, P2, where the price equals the minimum of the ATC curve, firms will still produce in the short run as they cover their AVC. However, since the price equals ATC, they earn zero economic profit. This situation highlights the distinction between accounting profit and economic profit, where the latter accounts for opportunity costs, leading to a situation where firms may continue to operate without making a profit.

For price level P3, which lies between AVC and ATC, firms will produce in the short run because the price is above AVC. However, they incur a loss in the long run since the price does not cover ATC. This loss is represented by the area between the price and ATC, indicating that firms will eventually exit the market if this condition persists.

At price level P4, which touches the minimum of the AVC curve, firms will produce in the short run as they cover their AVC, but they will not cover their ATC, leading to losses in the long run. This situation reflects a point of indifference for firms, as they may choose to produce to minimize losses but will ultimately exit if conditions do not improve.

Finally, at price level P5, which is below both AVC and ATC, firms will not produce in the short run or long run, as they cannot cover their variable costs. This scenario illustrates a clear exit decision, as continued operation would lead to unsustainable losses.

In summary, the relationship between price, average total cost, and average variable cost is crucial in determining whether firms will produce in the short run and whether they can sustain operations in the long run. Understanding these dynamics helps clarify the conditions under which firms will enter or exit a market.