Costs, perfect competition, monopolies, monopolistic competition Essay

* Total Cost = market value of inputs firm uses in production * Profit = TR – TC * Costs of production = opportunity costs of output of goods and services * Explicit costs = input costs that require outlay of money by firm * i. e. $1000 spent on flour = opportunity cost of $1000 because can’t be spent elsewhere * Implicit costs = input costs that do not require outlay of money by firm * i. e. working as baker at $10/hour, but could be making $20/hour as a computer analyst * Economists include both costs, while accountants often ignore implicit costs * Important implicit cost = opportunity cost of capital. * i. e. use $300,000 savings to buy factory, but could have invested it at interest rate of 5%/year * ? forgone $15,000/year in interest income = implicit opportunity cost of business * i. e. use $100,000 savings and borrow $200,000 from bank * Explicit cost will now include $10,000 paid to bank in interest * Opportunity cost is still $15,000 (OC of $10,000 paid to bank is $10,000 and there is a forgone interest savings of $5000) * Economic profit = TR – TC (including both explicit and implicit costs) * Accounting profit = TR – TEC (total explicit costs). * Consequently, accounting profit is often > economic profit * For economist, business is only profitable if it can cover all explicit and implicit costs Production & Costs * In short run = size of factory is fixed because it cannot be built overnight, but output can be varied by varying the number of workers * In long run = size of factory and number of workers can be varied * Production function: relationship b/w quantity of inputs used to make a good and the quantity of output of that good (short-run) * Marginal product = increase in output that arises from additional unit of input * MP = ? TP/? Q * Law of diminishing marginal product = property whereby the marginal product of an input declines as the quantity of the input increases * Slope of production function (quantity of input vs. quantity of output) = marginal product * Graph become â€Å"flatter† as marginal product decreases (see graph) * Total cost curve = graph w/ quantity produced on x-axis and total cost on y-axis * Graph becomes â€Å"steeper† as quantity of output increases (see graph). * Fixed costs = costs that do not vary with quantity of output produced * i.e. rent of factory, bookkeeper’s salary etc. * Variable costs = costs that do vary with the quantity of output produced * i. e. cost of raw materials, wages of workers (increases as more output produced) etc. * Average Total Cost = TC/Q * Also equal to average fixed cost + average variable cost * Average fixed cost = FC/Q * Average variable cost = VC/Q * Marginal cost = increase in total cost arising from an extra unit of production * MC = ? TC/? Q * Marginal cost rises as the quantity of output produced rises (see graph) Typical Cost Curves * In many firms, MP does not start to diminish immediately after hiring 1st worker * 2nd or 3rd worker may actually have higher MP than first, b/c a team of workers can divide tasks and work more productively than a single worker * AFC, AVC, MC, and ATC will look different for this scenario Costs in the Short Run and in the Long Run. * Division of total cost between fixed and variable costs depends on time horizon * In a few months, GM cannot adjust number/size of factories, only workers * Cost of factories, is therefore, fixed cost in short run * Over several years, however, GM can expand size and number of factories * Cost of factories, is therefore, variable cost in long run * Because fixed costs become variable in the long run, the ATC curve in short run differs from the ATC curve in the long-run * Long-run ATC is much flatter than short-run ATC * Short-run curves also lie on or above long-run curves. * Properties arise because firms have greater flexibility in the long run – can choose which short-run curve they wish to use * In short-run, b/c of diminishing marginal product, increasing quantity of output increases ATC * In long-run, there are situations where ATC does not change with an increase in output * Constant Returns to Scale: long-run ATC stays same as quantity of output changes * Diseconomies of Scale: long-run ATC rises as quantity of output increases . * Often arises because in large organizations, coordination problems arise – difficult to organize and mobilize vast amounts of labour and raw materials * Economies of Scale: long-run ATC falls as quantity of output increases * Often arises because at higher production levels, workers can specialize * Analysis explains why long-run ATC curves are often U-Shaped * Long-run ATC falls at low levels of production b/c of increasing specialization, and rises at high levels of production b/c of increasing coordination problems What is a competitive market? * Perfectly competitive market has two characteristics: (1) many buyers and many sellers in the market, (2) goods offered by various sellers are largely the same * Goal of perfectly competitive markets is to maximize profits * Actions of any single buyer or seller in market has negligible impact on market price * Each buyer and seller takes market price as given * i. e. no single buyer of milk can influence the price of milk because the buyer purchases a small amount relative to the size of the market * Each seller of milk also as little influence on price of milk, because it is selling milk that is virtually identical to the milk of other sellers. * B/c they must accept market price, buyers and sellers in competitive market = â€Å"price takers† * i. e.if a dairy farm doubles its output of milk, the price of milk remains the same, but their total revenue will double * Total revenue will increase because increase in quantity sold, not increase in price * Sometimes, (3) characteristic of competitive market also used – firms can freely enter or exit the market in the long run * Average revenue = total revenue/quantity sold. * AR = TR/Q * For all firms, average revenue equals the price of the good * Marginal revenue= change in total revenue from an additional unit sold * MR = ? TR/? Q * For all competitive firms, marginal revenue equals the price of the good Three general rules of profit-maximization: * If MR > MC, firm should increase its output * If MR < MC, firm should decrease its output * At the profit-maximizing level of output, MR = MC * Remember, because a competitive firm is a price taker, its MR is equal to the market price Note: In essence, because the firm’s marginal-cost curve determines the quantity of the good the firm is willing to supply at any price, it is the competitive firm’s supply curve Firm’s Short-Run Decision to Shut Down * Shut-down refers to short-run decision to not produce anything during a specific period of time b/c of current market conditions. * Exit refers to a long-run decision to leave the market * Firm that shuts down temporarily still has to pay fixed costs, whereas a firm that exits the market saves fixed costs and variable costs * i. e.if farmer decides not to produce crops one season, rent for land becomes sunk cost, but if farmer decides to sell farm altogether, no sunk costs * Firm shuts down if total revenue from production is less than its variable costs of production * Shut down if TR < VC * Alternatively, shut down if TR/Q < VC/Q . * Which means, shut down if P < AVC * On graph, if market price is less than minimum point on AVC curve, firm shuts down and ceases production – firm can re-open if market price changes to be higher than minimum point * Therefore, point at which MC intersects AVC is the â€Å"shutdown price† * If a firm shuts down temporarily, its fixed costs are sunk costs * Firm can safely ignore these costs when deciding how much to produce * i. e. why don’t many restaurants close down at lunch time when they are nearly empty? * Because the fixed costs (rent, kitchen equipment, plates, silverware etc. ) would still have to be paid, only the variable costs (cost of additional food and wages to stuff) would be saved * Owner can make enough profit to cover these variable costs, and therefore, keeps the restaurant open Firm’s Long-Run Decision to Exit or Enter a Market * The firm exits the market if the revenue it would get from producing is less than its total costs * Exit of TR < TC * Alternatively, exit if TR/Q < TC/Q * Which means, exit if P < ATC and enter if P > ATC * Therefore, point at which MC intersects ATC is the â€Å"exit/entry price† Measuring Profits from Graphs * Recall, Profit = TR – TC. * Alternatively, Profit = (TR/Q – TC/Q) x Q * Which means, Profit = (P – ATC) x Q The Supply Curve in a Competitive Market * So far we have examined supply decision of single firm – now examining supply curve of market * Two possibilities – short term = fixed number of firms, long term = firms can enter and exit The Short-Run: Market Supply with a Fixed Number of Firms * In short-run, the number of firms in the market is fixed * As a result, the market supply curve reflects the individual firms’ marginal-cost curves, only with increased magnitude (both graphs same, but market quantity multiplied by some scalar value) The Long-Run: Market Supply with Entry and Exit. * Assume all firms and all potential firms have same cost curves * If firms already in market are profitable, new firms will have incentive to enter the market * Entry if P >ATC because profit is positive (recall, Profit = (P – ATC) x Q) * Entry = expand # of firms, increase quantity of good supplied, and drive down prices and profits * If firms already in market are experiencing losses, firms may exit the market * Exit if P < ATC because profit is negative * Exit = decrease # of firms, decrease quantity of good supplied, and drive up prices and profits * At the end of this process of entry and exist, firms that remain the market must be making zero economic profit * In other words, the process of entry and exist ends only when price and average total cost are driven to equality (P = ATC). * This has a surprising implication—we earlier noticed that firms produce so that P = MC * We just noted that free entry and exist forced P = ATC * The only way this can occur is of MC = ATC, and this occurs only when the firm is operating at the minimum of average total cost—called the â€Å"efficient scale† * ? long-run equilibrium of a competitive market with free entry and exit must have firms operating at their efficient scale * Long-run supply curve (market) will be horizontal at the price which corresponds to the minimum of average total cost * Any P above this level generates profit, leading to entry and increase in total quantity supplied * Any P (price) below this level creates losses, leading to exit + decrease in total quantity supplied * Eventually, number of firms in market adjusts so P = minimum of ATC, and there are enough firms to satisfy all the demand at this price Why do competitive firms stay in business if they make zero profit? * Remember that economic profits are not the same as accounting profits * Economic profit accounts for opportunity cost as well * So, when a firm makes zero economic profit, it may still be making accounting profits A Shift in Demand in the Short Run and Long Run * Because firms can enter and exit more easily in the long run than in the short run, the long-run supply curve is typically more elastic than the short-run supply curve Chapter 15: Monopoly Why Monopolies Arise. * Firm is monopoly if it is sole seller of its product and if its product has no close substitutes * Case of monopoly is barriers to entry: a monopoly remains only seller in a market because other firms cannot enter market and compete with it * Barriers to entry are monopoly resources, government-created monopolies, and natural monopolies Monopoly Resources. * Single firm owns a key resource * i. e. only one well in town and no way to get water from anywhere else * Rarely occurs because economies are large and resourced owned by many people Government-Created Monopolies * Government gives one person or firm exclusive right to sell good or service * Two important examples are patent and copyright laws * Both lead to higher prices than under competition, but encourage desirable behaviour * Drug companies allowed patents to encourage research, and authors allowed copyrights so they write more original books * Monopoly = increased incentive for creative activity, but at a higher cost Natural Monopolies. * Single firm can supply good or service to entire market at lower cost than could 2 or more firms * Occurs when firm has economies of scale over relevant range of output * In other words, firm’s ATC curve continually declines because when production is divided among more firms, each firm produces less, and ATC rises – single firm can produce as smallest cost * i. e. to provide water to town, firm must build network of water pipes – if two firms involved, both would have to pay fixed cost of water pipe, resulting in increased ATC. * Natural monopoly = less concern about new entrants * Normal monopoly’s profits attract entrants to market, but in a natural monopoly, new entrants cannot achieve same low costs that monopolist enjoys * If a market expands (greater demand) natural monopoly can evolve into competitive market Monopoly vs. Competition. * Monopoly can influence market price of output, while competitive firm cannot * As monopoly is sole producer in market, it can alter price of good by adjusting supply to market * Demand curve for competitive market is perfectly elastic (can sell as little or as much as it wants at one price), while down-ward sloping for monopoly * ? monopoly has to accept lower price to sell more output, and can only accept higher price by selling less output – so what price and quantity will it choose to maximize profits? Monopoly’s Revenue * AR = price of good (true for monopoly and competitive), but MR is not equal to price of good. * As a result, average-revenue curve is also monopolist’s demand curve * When monopolist increases quantity sold, has two effects on total revenue (P x Q): 1) the output effect = more output sold, so Q is higher, which trends to increase total revenue 2) the price effect = price falls, so P is lower, which tends to decrease total revenue * Competitive firm as no price effects – price taker, therefore can sell as little or as much as it wants, without any change in price * ? Output/price effect causes monopolist’s MR after first unit sold to always be less than price of the good * Consequently, monopoly’s marginal-revenue curve always lies below its demand curve Profit Maximization * Profit-maximizing quantity of output as determined by intersection of MR and MC curve * Some key differences between monopolies and competitive firms: * P = MR = MC (competitive). * P > MR = MC * In competitive markets, price equals marginal cost, and in monopolized markets, price exceeds marginal cost – crucial to understanding the social cost of monopoly Monopoly’s Profits * Recall, Profit = TR – TC * Alternatively, Profit = (TR/Q – TC/Q) x Q * Which means, Profit = (P – ATC) x Q * Same as in competitive markets Monopoly Drugs vs. Generic Drugs * What happens to price of a drug with patent runs out? * Monopoly firm maximizes profit by producing quantity at which MR = MC, and charging price well above MC * Therefore, when patent runs out, the price of the good falls to MC * Note: MC for drugs is almost always constant. * Monopolist does not lose all market, however, because many buyers remain loyal to brand-name, and therefore, brand-name can still sell at slightly higher price than â€Å"generic brands† Welfare Cost of Monopoly * Monopolies = higher prices than competitive firms = undesirable for consumers = desirable for producers in terms of total revenue * Is it possible that monopoly is desirable from the standpoint of society as a whole? * Recall total surplus measures well-being of buyers and sellers in a market * Producer surplus is amount producers receive for a good – (minus) their costs of producing it * Consumer surplus is consumers’ willingness to pay for a good – amount they actually pay for it * In this case, single producer is monopolist The Deadweight Loss * Consider case of a â€Å"benevolent social planner†. * Social planner care not only about profit earned by firm’s owners, but also benefits received by the firm’s consumers * Planner tries to maximize total surplus, which is producer surplus (profit) plus consumer surplus * Alternatively, value of good to consumers – costs of making the good to monopoly producer * Demand curve reflects value of good to consumers *. Marginal cost curve reflects cost to the monopolist * Consequently, the socially efficient quantity is found were the demand curve and marginal-cost curve intersect * If social planner were running the monopoly, he would achieve efficient outcome by charging the price found at the intersection of demand curve (AR-curve) and the MC curve – much like a competitive market * However, monopolists charge the price found at the intersection of the MC and MR curve * ? the monopolist produces less than the socially efficient quantity of output, and charges more than the socially efficient price * When the monopolist charges a price higher than the marginal cost, some potential consumers value the good higher than the MC but lower than the monopolist’s price * Consumers do not buy the good, and monopoly pricing prevents mutually beneficial trade * The deadweight loss triangle = total surplus lost = reduction in economic well-being from monopoly Is Deadweight Loss a Social Problem? * Not necessarily a problem for society * Welfare in monopolized market includes welfare or both consumers and producers * When a consumer pays extra dollar to producer because of monopoly price, consumer is worse off by a dollar, and producer is better off by same amount * Transfer from consumer to producer does not affect total surplus—sum of consumer and producer surplus * Unless, consumers are for some reason more deserving than producers—a normative judgement about equity that goes beyond realm of economic efficiency. * Problem arises because firm produces and sells a quantity of output below the level that maximizes total surplus Price Discrimination * Business practice of selling the same good at different prices to different consumers * Can occur in a monopoly (firm with market power), not in a competitive market * In competitive market, many firms selling same good at market price—no one would lower market price for any customer as they can sell any given quantity at one price * Increasing price would also be pointless, as customer would simply buy from another firm A Parable about Pricing. * Dry-cleaning example from class – charge adults $10 and charge students $5 with a stdent card * Choosing to forgo market of students at $5 results in deadweight loss because students do not end up putting their shirts into dry-cleaning, though they value the service more than its MC of production * With price-discrimination, however, everyone ends up with a shirt . * Price discrimination can eliminate the inefficiency inherent in monopoly pricing, because differentiating prices allows producer to charge customer price closer to customer’s willingness to pay than is possible with a single price Notes about Price-Discrimination * Monopolist must be able to separate customers according to willingness to pay—either geographically, by age, by income etc. * Arbitrage prevents price-discrimination – process of buying good in one market at a low price and selling it in another market for a higher price * Increased welfare from price-discrimination is all higher producer surplus, not consumer surplus * Adults/students no better off from having cleaned shirts—paid price they were willing to pay * Entire increase in total surplus is a result of higher profits for the monopolist The Analytics of Price Discrimination. Perfect price discrimination = situation in which a monopolist knows exactly the willingness to pay of each customer and can charge each customer different prices accordingly * Monopolist gets the enter surplus in every transaction * Also sometimes referred to as first-degree price discrimination * Refer to diagrams (a) and (b). * (a) firm charges single price above MC, and b/c some potential customer who values good at more than MC does not buy it at this high price, monopoly causes deadweight loss * (b) each customer who values good at more than MC buys good and is charged willingness to pay – mutually beneficial trade takes place, no deadweight loss, and entire surplus derived from market goes to monopoly producer in form of profit * Of course, in real life, price discrimination is never perfect because various customers are willing to pay various different prices – two forms of imperfect price discrimination . * 1) second-degree price discrimination = charging different prices to same customer depending on quantity of product bought * 2) third-degree price discrimination = market can be segmented and segments have different elasticities of demand * i. e. movie theatres charge lower price for children and senior citizens than for other patrons * Makes little sense in a competitive market, where price = MC, and MC for providing seat to child/senior citizen is same as anyone else. * If movie theatre has local monopoly, however, price-discrimination has motives * Demand curve for adults is less elastic, therefore can charge higher price, whereas demand curve for children/seniors is more elastic, therefore can charge lower price * How does imperfect price discrimination affect welfare? * Compared to monopoly outcome with single price, imperfect price discrimination can raise, lower, or leave unchanged total surplus in a market—however, always raises monopoly’s profits Examples of Price Discrimination * Airline Prices – charge less if stay over Saturday night or purchase two weeks ahead to separate personal travellers, from business travellers, who pay more * Discount Coupons – rich, busy executive will not clip coupons, whereas a unemployed individual will, allowing price discrimination * Financial Aid – separate wealthy students willing to pay high tuition from less well-off students * Quantity Discounts – bulk is cheaper because customer’s willingness to pay for an additional unit declines as the customer buys more units Public Policy towards Monopolies. * Monopolies fail to allocate resources efficiently * Produce less than socially desirable quantity of output * Charge prices above marginal cost Policymaker’s Response * Increasing Competition with Competition Law – for example, mergers * Regulation – natural monopolies not allowed charging whatever price they want, but what price should government set of a natural monopoly? * One might conclude set P = MC, so customers equal quantity of output that maximizes total surplus, and allocation of resources is efficient * However, natural monopolies always have declining ATC ? MC < ATC, if P = MC, then P < ATC, and firm loses money and exits industry * Government can subsidize monopolist and pick up losses inherent to MC-pricing, but would need to raise money through taxation for subsidy, and taxes have own deadweight loss * Alternatively, regulators can allow monopolist to charge price higher than MC, and if regulated P equals ATC, monopolist earns exactly zero economic profit * Yet, average-cost pricing leads to deadweight losses b/c monopolist’s price no longer reflects MC or producing good * Ultimate problem with MC- and AC-pricing is it gives monopolist no incentive to reduce costs—normally reduce costs to increase profits, but in these cases, monopolist will not benefit * Solution: keep some benefits from lower costs in form of higher profit, and practice something that is a small departure from MC-pricing. * Public Ownership—government owns natural monopoly instead of private firm * Doing Nothing—degree of â€Å"market failure† in economy smaller than â€Å"political failure† in gov’t Differences and Similarities | Competition| Monopoly| Similarities| Goal of firms| Maximize profits| Maximize profits| Rule for maximizing| MR = MC| MR = MC| Can earn economic profits in short run? | Yes| Yes| Differences| Number of Firms| Many| One| Marginal Revenue| MR = P| MR < P| Price| P = MC| P > MC| Produces welfare-maximizing level of output? | Yes| No| Entry in long run? | Yes| No| Can earn economic profits in long run? | No| Yes| Price discrimination possible? | No| Yes| Chapter 16: Monopolistic Competition. * Oligopoly: market structure in which only a few sellers offer similar or identical products * Concentration ratio: percentage of total output in market supplied by four largest firms * Monopolistic competition: market structure in which many firms sell products that are similar but not identical—following qualities: * Many sellers ? firms competing for same group of customers. * Product differentiation ? downward-sloping demand curve * Free entry and exit ? market adjusts until economic profits driven to zero Monopolistically Competitive Firm in the Short Run * Products are different ? faces downward-sloping demand curve * Same profit maximization rule as monopoly (Q at MR = MC and equivalent P on demand curve) * Identical to monopoly The Long Run Equilibrium. * When firms make profit in the short-run, new firm have incentive to enter the market * Demand curve shifts to left (reduces demand of each individual firm) * As demand for firms’ fall, firms experience declining profit * Conversely, when firms incur losses in short-run, firms exit * Demand curves shift to right (demand experienced by individual firms increases) * As demand for firms’ products rises, firms experience rising profit. * Entry/exit continues until firms in market make zero economic profit (P = ATC) * Demand curve is tangent to ATC (just touching, never crossing) * Characteristics of long-run equilibrium in monopolistic competition * As in monopoly market, P > MC (for profit maximization, MR = MC, and downward-sloping demand curve makes MR < P) * As in competitive market, P = ATC (free entry and exit drive economic profit to 0) Monopolistic vs. Perfect Competition Excess Capacity. * Entry and exit drive each firm in monopolistically competitive market to point of tangency between demand and ATC curves * However, this means quantity produced is less than that produced at the â€Å"efficient scale† –quantity that minimizes ATC (point at which MC intersects with ATC) * Perfectly competitive firms produce at the efficient scale * Monopolistically competitive firms therefore have excess capacity—they are not producing as much as they potentially can * Firm forgoes opportunity to produce more because it would need to cut prices to sell the additional output * More profitable to continue operating at excess capacity Markup over Marginal Cost. * Relationship between Price and Marginal Cost also different * Competitive firm, P = MC * Monopolistic competition, P > MC, because it must be for P = ATC * This leads to behavioural differences b/w perfect and monopolistic competitors * Perfectly competitive firm does not care for additional customers because P = MC, profit from extra unit sold is always zero * By contrast, monopolistically competitive firms P > MC, therefore, extra units sold = more profit Monopolistic Competition and Welfare of Society * One source of inefficiency is that P > MC * Some consumers who value good at more than MC, but less than P will not buy the good * ? deadweight loss similar to that of monopoly pricing * Another source of inefficiency is: 1) Product-variety externality: b/c consumers get some consumer surplus from introduction of new product, entry of new firm conveys +ve externality on consumers 2) Business-stealing externality: b/c other firms lose customers and profits from entry of a new competitor, entry of new firm imposes negative externality on existing firms * Perfectly competitive firms produce identical goods and charge P = MC, therefore neither externality exists under perfect competition * ? Monopolistically competitive markets do not have desirable welfare properties of perfectly competitive markets because it is not ensured that total surplus is maximized * Also very difficult to control these inefficiencies through public policy Advertising * Amount of advertising depends on products * Firm that sells highly differentiated consumer goods i. e.soft drinks, will need to advertise more than seller of undifferentiated industrial nails, or homogenous products like wheat * Some people critique advertising for convincing people that products are more different than they actually are, fostering brand loyalty and encouraging consumers to ignore price differences * With less elastic demand curve, firm charges larger markup over MC. * Support for brands suggests that brands provide consumers with information about quality of goods, and gives firms incentive to maintain high quality to protect reputation of brand names * Others believe encourages competition as it makes customers better informed about products * Advertising can signal quality of product as well, because firm willing to spend money on advertising must be creating a good product.