# 5 Market Games For Teaching Economics

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1 5 Market Games For Teaching Economics

2 Progression 5 Market Games from website economics-games.com To be played separately or as a sequence: Market Game 1: Sunk costs, monopoly, and introduction to the next games Market Game 2: Impact of fixed costs and capacity constraints on price and profits, with differentiated goods Market Game 3: Impact of the number of competitors on price and profits Market Game 4: Price and quantity competition and CO2 environmental policies (quotas, taxes and emission permits) (Market Game 2b is a variant of market game 2, with homogenous goods) Demand is identical in all of these games (proportionally to the number of players on the markets), except game 2b.

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4 MARKET GAME 1: SUNK COSTS, MONOPOLY, AND INTRODUCTION TO THE OTHER GAMES

5 Objective Very short game (5 minutes), intended to: Introduce student to the demand function that will be used in the following games. Introduce a monopoly benchmark that will be useful to compare with the competition situations later. Have students understand the impact of sunk costs on the ranking of alternatives.

6 Description Players are in a monopoly position on 2 identical markets: On each market, the marginal cost of production is constant and equal to 4. Players can sell up to 1000 goods on each market. What differs is that on the second market, there is a sunk cost equal to Repeated

7 Why is this game interesting? This game can seem obvious, but it is very effective as an introduction to sunk costs and monopoly pricing. If players do not realize from the start that the optimal price is the same on both markets, they will come to understand this easily by tatonnement. By changing their price by tatonnement from one round to the other, they find themselves in a situation where marginal reasoning is perfectly natural. This game provides a monopoly benchmark for later games (monopoly price ~ 96, monopoly profit net of sunk costs: ~ 40680). Even if this is not so fun, players will do it carefully in order to prepare for later multiplayer games and get accustomed to the demand function (provided it does not last too long).

8 Demand Price Sales (average) 762,02 727,39 694,46 663,34 632,6 603,52 575,3 548,04 521,74 496,55 471,26 Price Sales (average) 446,95 423,24 400,1 377,49 355,37 333,63 312,39 291,51 270,74 250,8 231,28

9 Possible Theoretical debriefings Impact of sunk costs on the ranking of alternatives. Marginal Revenue, decreasing marginal revenue and marginal cost. Illustrates the interest of marginal reasoning through the search for the monopoly price (possible debriefing with demand data). Cost pass-through (monopoly price with 4 marginal cost is ~ 96, revenue maximizing price is ~ 94)

10 MARKET GAME 2: IMPACT OF FIXED COSTS AND CAPACITY CONSTRAINTS ON PRICE AND PROFITS (DIFFERENTIATED GOODS)

11 The interface, Decisions

12 Objective Longer game (45 minutes 1h), intended to: Explain the logic behind competition. Compare oligopoly with monopoly. Have students understand the impact of sunk costs on prices. Have students understand the impact of avoidable fixed costs on prices. Have students understand the impact of capacity constraints on prices and profits.

13 Description Players compete against the same other players on 5 identical markets: What differs is that on some markets there are avoidable or unavoidable fixed costs, and on others not. Production capacities also differ from one market to another. Demand is the same as in game 1 (proportionally to the number of competitors on the markets). Repeated game

14 Description Parameters on the 5 different markets: Marginal Cost Fixed Costs? Capacity constraints Market 1 4 No 1000 Market 2 4 Sunk Costs, Market 3 4 Sunk Costs, Market 4 4 Sunk Costs, Market 5 4 Avoidable Costs,

15 Remark 1: Demand Demand is based on a logit model. There is a number of potential customers «arriving» one after the other on the market, and then considering buying one unit of good to one of the firms that still have something to sell. The reservation value of each customer is randomly drawn Along with another random draw (to capture unmodeled «horizontal» differences between the goods), this determines who he buys from, if he buys from someone (this is the only difference with game 2b, in which a customer always buys from the cheapest firm that still has goods to sell when he arrives on the market). In all our games, in order to facilitate comparison, demand is proportional to the number of firms on the market: 5 teams on each market 5 times as many potential customers as in the monopoly game presented before.

16 Market game 2b Market Game 2b is identical to Market Game 2, except that goods are perfectly homogenous: The reservation value of a customer is randomly drawn, as in game 2 but there is no random draw to determine which firm he buys from: He always buys from one of the the cheapest firms that still have goods to sell when he arrives on the market.

17 Remark 2: Parameters calibration M 3: Production Capacity 400 Total production capacity is close to the monopoly quantity. M 1, 2, 5: Production Capacity 1000 Price convergence is more slow than in market 4, because of weaker incentives to choose a very low price. In Game 2b, with non-differentiated demand: Production capacity of 1000 limits short run competition, price remains above the equilibrium price with no capacity constraints, and eventually all firms sell up to their capacity. The level of fixed cost on markets 2 to 5, 35000, is such that: If there are 5 or 6 players by market, one or two of them should decide to stay out of the market 5. Profits on markets 2 and 4 will be negative, and the best players can do is to accept that and try and accomodate the situation (and not base their price on average cost!).

18 Recommended Settings Split players across separate universes : Players from one universe only interact with other players from the same universe (yet compete with every other player for the highest score) This is useful to limit over-aggressive strategies Balance between competition and cooperation Recommended settings: More than 1 universe if possible, 1 universe for 5-6 players

19 The interface, Results

20 Possible Theoretical debriefings Comparison between monopoly and oligopoly (price and profits). What drives competition? Residual demand and marginal revenue. Price elasticity of demand and the sales/margin trade-off The prisoner s dilemma Capacity constraints as limits to price competition, keeping prices and profits above the unconstrained level. First evocation of short run vs long-run competition (more about that in the last game) Analogy «capacity constraints / increasing marginal costs»

21 Possible Theoretical debriefings Impact of sunk costs (for one-shot interactions): On best response functions. On equilibrium prices if every player is rational and believes that every other player is rational More advanced: On players strategies if players are rational and expect that some of their competitors will not be rational and will increase their price Possible discussion about Bertrand competition with differentiated goods and capacity constraints, prices as strategic complements, etc. The role of expectations Possible presentation of the notion of Nash Equilibrium. Possible discussion about what can happen if the process is iterated and about the stability of Nash equilibria.

22 Possible Theoretical debriefings Impact of avoidable fixed costs When it does not drive any firm out of the market (=sunk cost) When it drives some of the firms out of the market (higher price and profit, but through less competition) Price in the short run determined by avoidable costs AND demand AND capacity constraints (and )

23 Instructor s Interface

24 More More on this game and on how to use the site:

25 Possible Extensions to study collusion with market game 2 Have the students play again with new parameters: Anonymous players on some universes, and not on others? Encouraging communication or not? More or less uncertainty about the end of the game? Only allow price changes once every 2 or 3 rounds, on some of the markets? On some markets/universes, you can invite students to declare a price on the blackboard (non-binding declaration)

26 MARKET GAME 3: IMPACT OF THE NUMBER OF COMPETITORS ON PRICE AND PROFITS

27 Objective Short game (15 minutes), intended to: Explain the logic behind competition. Compare oligopoly with monopoly. Have students understand the impact of the number of competitors on the competition intensity.

28 Description Players compete against other players on 2 markets with a different number of competitors: Demand is proportional to the number of competitors. Repeated game Recommended setting: 2-players markets for the first experiment (i.e. n/2 universes), and 2 big universes with half of the players for the second experiment. Avoid having only 1 universe to avoid over-aggressive strategies.

29 Possible Theoretical debriefings Comparison between monopoly and oligopoly (price and profits). What drives competition? Residual demand and marginal revenue. Price elasticity of demand and the sales/unit-price trade-off. The prisoner s dilemma. Collusion and repeated games (+ impact of the number of competitors on collusion)

30 MARKET GAME 4: PRICE AND QUANTITY COMPETITION, AND CO2 ENVIRONMENTAL POLICIES (QUOTAS, TAXES AND EMISSION PERMITS)

31 Objective Longer game (1h30-2h), intended to: Introduce a few basic environmental policy tools: taxes, subsidies, quotas, permits and explain how/why they work. Highlight the importance of marginal reasoning and opportunity costs. Have students realize the dangers of misusing average costs. Show the impact of marginal cost on price. Show how quantity competion in the long-run articulates with price competition in the short-run. Can be played after market games 1 and 2, or on its own. In this case, I would recommend having the students play this game as a monopoly, first. get accustomed to the demand function. get accustomed to the environmental policies. provides a useful benchmark for the multiplayer game.

32 Description Impact of environmental policies in a setting with quantity precommitment followed by price competition. Players repeatedly take price and quantity decisions on four markets subject to different environmental policies for CO 2 emissions: no policy benchmark, unit taxes, quotas permits Production costs and demand are the same on all markets (same as in other games) Detailed Rules are available here:

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35 Costs and Policies Costs: A firm must pay 15 for each good produced, and then 4 for each good sold. Each good produced «emits» 0.5 tons of CO 2 Environmental policies: Market 1: benchmark market, no environmental policy. Market 2: 40 tax by ton of emitted CO 2 Market 3: (non-tradable) quotas, 300 tons of CO 2 by round Market 4: CO 2 emissions permits. Each firm receives 600 permits for free (or 300 permits by round). With a permit, a firm can emit one ton of CO 2 at no cost. If a firm emits more CO 2 than it has permits, it will buy permits at a price of 40 for each exceeding ton of CO 2. If it emits less CO 2 than it has permits, it will sell unused permits at a price of 40 each. Remark: for a 40 unit tax, producing 1000 goods costs (15+0.5*40)*1000, i.e If all firms decide to produce 1000 goods, they will find themselves exactly in the same situation as in market 2 of the second market game.

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38 Possible Theoretical debriefings «Average cost of CO 2 emissions» vs «marginal cost of CO 2 emissions». Opportunity costs and emissions reduction subsidies (or permits resale) Impact of the 3 environmental policies on CO 2 emissions, prices and profits. Differences in practice. Windfall profits and quotas.

39 Possible Theoretical debriefings How and to what extent are taxes (or marginal cost changes) passed through to prices. Comparison with the impact of sunk costs on prices. How some variable costs in the long-run turn into sunk costs in the short-run. What would happen in the short-run if a sudden, unexpected and severe demand crisis happened? Cournot and Bertrand equilibria

40 Many other games on: IO and Microeconomics Games Air Transport Economics Game Energy Economics Game CO 2 Emissions and Environmental Policies Games

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