When a game asks us to buy something, the price is usually easy to see. A building costs three wood and two stone. A card costs five coins. An action requires one worker. These are direct costs, and because they are printed on cards, boards and player aids, they are also the costs designers tend to think about first. They determine whether an action is affordable, how quickly players can progress, and how scarce a particular option will be.
But the number printed beside an action is only one part of what that action costs. The moment a player has more than one possible use for a resource, spending it also means giving up everything else that resource could have done. A card used for movement cannot later be used to cure a disease. A worker placed on one action space cannot be placed on another. A wild resource used as wood is no longer available when iron becomes scarce. Even choosing to invest in future production has a cost, because the same resources could have produced something useful right now.
This distinction between direct cost and opportunity cost is one of the most useful ways to think about resources in game design. Direct cost determines whether a player can make a choice. Opportunity cost helps determine whether that choice is interesting.
The price on the card is only the visible cost
Direct costs are the easiest part of an economy to balance because they can usually be expressed numerically. If a powerful card is being purchased too early, its price can be increased. If players rarely choose a particular action, its cost can be reduced. Designers can compare production rates with prices, calculate how many turns an investment needs to repay itself, and estimate how much of a particular resource will enter or leave the system.
These costs matter, but by themselves they often produce relatively simple decisions. If two actions both use money, and one gives me clearly more value for the same amount, there may be little reason to choose the weaker one. The decision becomes more interesting when the things being compared cannot be reduced so easily to the same scale, or when paying for one option changes my ability to pursue another.
Imagine that I have four coins and can buy either a building that scores points or a tool that improves my future production. Both may cost the same four coins, but the real comparison is not between two identical prices. Buying the building means giving up future efficiency; buying the tool means giving up immediate progress. The direct cost is four coins in both cases. The opportunity cost is completely different.
This is why two actions with the same printed price can feel very different. The economic question is not only what leaves my supply when I act, but what possibilities disappear with it.
A resource becomes more interesting when it has competing uses
Money in Sheriff of Nottingham is relatively straightforward. It can move between players through bribes and penalties and eventually contributes to the final result, but much of the time its role is recognizable as money: I have a quantity of it, and paying some amount leaves me with less. The decision can still be difficult, especially when negotiation is involved, but the resource itself has a fairly legible function.
Pandemic creates a different problem. A city card is not merely something I own; it belongs to several systems at once. The New York card might help me travel, but cards of the same color are also required to discover a cure. If I discard New York to move across the map, the direct cost is one card. The more important cost may be that I have just moved farther away from completing a cure. The game does not need to charge me an additional token or penalty for that decision. The competing use of the card already creates the price.
The same principle appears in 7 Wonders, where a card can become the structure printed on it, be discarded for money, or be used to construct a stage of a wonder. A single object therefore represents several mutually exclusive futures. Choosing one of them destroys the others, which means that the value of the card cannot be understood only by reading the effect printed on its face.
A Game of Thrones: The Board Game uses power tokens across several systems as well. They can matter for influence, control and other forms of political leverage, so spending them in one context affects what a player can do elsewhere. In systems like these, scarcity alone is not what makes the resource interesting. The important pressure comes from competition between uses.
This is a powerful design tool because it can create difficult decisions without adding more resources. Instead of giving the player one currency for movement, another for development and a third for scoring, the same resource can connect several systems. The economy becomes denser, because every decision in one part of the game can create consequences in another.
Opportunity cost exists even when nothing is physically spent
The word cost often makes us think about something leaving our possession, but many of the most important costs in games do not work that way. Time is an obvious example. If I can take only one action on my turn, choosing to trade means I am not building, moving or attacking. Nothing has necessarily been removed from my supply, yet the action has still cost me every alternative use of that turn.
Worker placement makes this visible by turning actions into physical commitments. A worker placed on one space is usually unavailable elsewhere until it returns. The worker has not been destroyed, and in many games I know I will receive it again at the end of the round, but its current use still carries a cost because my remaining options have narrowed.
Turn order can be priced in exactly the same way. In Azul, taking the first-player marker comes with negative points. In Citadels, selecting the King means not selecting another character. In Lords of Waterdeep, securing first position for the next round requires committing an agent that could have been used elsewhere. These games are all assigning a price to acting first, but the currencies they use are different: points, alternative powers, or an action itself.
What makes these systems useful from a design perspective is that they remind us that almost anything scarce can function as a cost. Actions, time, position, information, flexibility and access can all be spent even when they never appear as a pile of tokens in front of the player.
Flexibility has a price because commitment has a price
Flexible resources are especially interesting because much of their value comes from opportunity cost. A locomotive in Ticket to Ride can stand in for any color. A generic port in Catan can exchange a wider range of resources than a specialized port, although less efficiently. A gold token in Splendor can substitute for another gem color. None of these options necessarily creates more immediate output than a specialized alternative. What they create is the ability to postpone a decision.
That postponement has value because committing early carries risk. If I convert everything into the resource I think I will need and the situation changes, I may be left with the wrong thing. A flexible resource allows me to wait until I know more. In effect, I am paying for the right to make the decision later, when uncertainty has been reduced.
This is also why flexibility usually needs a cost of its own. If a wild resource is as cheap and efficient as every specialized resource it can replace, there is little reason to commit to anything else. Ticket to Ride, Catan and Splendor each place different restrictions around flexibility because an option that preserves many future possibilities is itself valuable. The price is not arbitrary; it compensates for the opportunity cost the player avoids by remaining flexible.
Seen this way, specialization and flexibility are not simply two different resource types. They represent two different relationships with future uncertainty. Specialization often buys efficiency at the price of commitment, while flexibility sacrifices some efficiency in order to preserve options.
Investing in the future means paying with the present
Another common form of opportunity cost appears in engine building. In Splendor, I can collect gems that help me buy something soon, or purchase a development card that permanently discounts future purchases. In Century, an action can be used to improve the system that will generate later turns rather than extracting value immediately. Dice Forge lets players upgrade faces that will continue producing results on future rolls. Deck-building games frequently ask players to spend purchasing power on cards whose real value will only appear after they are drawn again and again.
These investments are often described according to their return: how many coins a discount will save, how many resources an upgraded die will generate, or how often a new card is likely to cycle through the deck. But every investment also has a cost that is easy to overlook. While I am buying the future, I am not using those same resources to improve my position now.
This creates one of the central tensions of engine-building games. Early in the game, a modest recurring benefit may be extremely valuable because there is enough time for it to accumulate. Late in the game, the same purchase may never repay what I gave up to acquire it. The direct cost of the upgrade has not changed, but its opportunity cost has, because the immediate alternatives become increasingly important as the end approaches.
A good investment decision therefore cannot be evaluated only by asking whether the engine component will eventually generate more than it costs. The player also has to ask what could have been achieved with those resources during the time spent waiting for the investment to pay back. A theoretically profitable engine can still be the wrong choice if the game ends before that future becomes useful.
Hoarding reveals another hidden cost
Players do not only pay when they spend resources. Sometimes they pay by refusing to spend them. Anyone who has finished a game with a powerful one-use card, a pile of healing items or a reserve of money saved for an emergency that never arrived has experienced this. Keeping the resource felt safe, but the safety had a price: every turn in which the resource remained unused was a turn in which its potential value was not converted into an actual effect.
This does not mean that holding resources is irrational. Keeping something in reserve can preserve flexibility and protect against future scarcity, and sometimes that is exactly the correct decision. The design question is whether players have enough information to judge that tradeoff, and whether the game gives resources a reason to move rather than accumulate indefinitely.
Hand limits, storage limits and declining value all change this calculation. Catan’s hand-size risk discourages excessive accumulation because a large hand can become vulnerable. Splendor’s token limit forces players to consider not only which gems they want to take but which ones they are willing to keep. Resources whose relative value declines as the game develops create another form of pressure: a small amount of money may be powerful early and negligible later, so waiting for the perfect moment can mean watching the resource lose much of its usefulness.
These mechanisms effectively put a cost on waiting. They remind players that keeping an option open is not always free, just as committing to an option is not always free. The tension between those two costs is often where the decision becomes interesting.
Good costs create tradeoffs, not just obstacles
A cost can certainly be used as a brake. Increasing a price slows players down, restricts access and helps control the pace of a game. But the more interesting use of cost is to shape what players have to give up in order to get what they want. If every desirable action simply requires accumulating enough of a dedicated currency, much of the decision can become a question of efficiency: find the fastest way to produce the currency, then buy the strongest option available.
When resources connect several systems, the same purchase can become harder to evaluate. Spending a card may improve mobility while delaying a cure. Spending a worker may gain resources while surrendering another action space. Spending flexible currency may solve the current problem while removing protection against the next one. Investing may create a stronger future while allowing an opponent to move ahead in the present. None of these decisions needs a complicated price formula. The complexity comes from what the player must abandon.
This is why opportunity cost is not merely an economic concept that happens to appear in games. It is one of the basic materials of meaningful choice. A choice matters when selecting one possibility changes my relationship with the others. Resources are particularly good at creating that relationship because they allow designers to connect otherwise separate actions through a shared limitation.
When designing a resource, then, I would not stop after asking how much of it players receive and how much each action should cost. I would also ask what else the resource can do, what disappears when it is spent, what remains unavailable while it is committed, what future it could have created, and what the player sacrifices by keeping it instead of using it.
The price printed on the card tells the player what they have to pay. The design becomes interesting when the player also has to decide what they are willing to give up.