The Basic Economic Problem and Opportunity Cost

The number you cannot see

You will already have met the two sentences this topic is usually built on. Wants are unlimited and resources are not, which is scarcity. And the opportunity cost of a choice is the next best alternative you gave up to make it. Both are true, both are worth knowing, and learned as definitions they do almost nothing for you. ⚠️ HERE IS WHAT OPPORTUNITY COST IS ACTUALLY FOR, AND IT IS THE REASON YOUR SPECIFICATION ASKS YOU TO EVALUATE CHOICES RATHER THAN JUST DESCRIBE THEM. Suppose a council spends money on a new leisure centre. Ask whether that was a good decision and most answers reach straight for what the leisure centre does: people get fitter, the town gets a facility, jobs are created. All true. And it is only half a page of accounts. ⭐ YOU CANNOT SAY WHETHER A CHOICE WAS GOOD UNTIL YOU KNOW WHAT WAS GIVEN UP FOR IT. The same money could have repaired the roads, or funded a library, or simply not been raised in the first place. ⚠️ UNTIL SOMEBODY NAMES THAT ALTERNATIVE, THERE IS NOTHING TO WEIGH THE LEISURE CENTRE AGAINST, and an evaluation with nothing on the other side of the scales is not an evaluation at all. ⭐ SO OPPORTUNITY COST IS NOT A DEFINITION TO RECITE. IT IS THE TOOL THAT MAKES A CHOICE EVALUABLE, and it is the only one you have. Which is also why the wording is so fussy. ⚠️ NOT ANY ALTERNATIVE. THE NEXT BEST ONE. If you name a poor alternative, the cost looks small and the choice you are judging comes out looking better than it deserves. The word "best" is doing real work there, and treating it as decoration quietly flatters every decision you examine. And there is one more thing your specification adds that most do not. ⭐ SOME OF WHAT A CHOICE GIVES UP NEVER APPEARS IN MONEY AT ALL, which is where the rest of this module goes.

One choice, three sets of books

The same decision, counted three ways. Your specification asks for all three, and the second and third are where most answers stop short.

Tap what an evaluation actually needs

Tap the TWO statements that describe what is required to judge whether an economic choice was a good one.

• The next best alternative that was given up, so there is something to weigh the choice against
• The costs that fall on other people or on the environment, which may never appear in money
• A full list of everything good the choice achieved, which is enough on its own
• Whether most people said they supported the decision at the time

Why the second best, and not any other

A student evaluating a decision to build a car park names the alternative given up as "leaving the land empty". Why does that weaken their evaluation?

• Because the next BEST alternative is what counts, and naming a poor one makes the cost look small so the choice appears better than it deserves
• Because leaving land empty is never an option that anyone would consider
• Because you must list every alternative that was given up, not just one
• Because an alternative has to be something that earns money

Five words used exactly

Five terms, each defined by what it is. No choice is evaluated here.

Match each choice to what it gave up

Two that follow from the tool

Select the TWO statements that follow from treating opportunity cost as an evaluation tool.

• A choice can be economically sensible and environmentally unsustainable at the same time, and an evaluation should say so
• Until the alternative given up has been named, there is nothing to weigh the choice against
• If a cost cannot be counted in money, it should be left out of the evaluation
• A choice that costs no money has no opportunity cost

Writing an evaluation instead of a list

Evaluation questions on this topic reward a shape, and most answers never reach it. ⚠️ NAME THE ALTERNATIVE BEFORE YOU JUDGE ANYTHING. An answer that says what a choice achieved, however fully, has described it. An answer that says what was given up instead has begun to evaluate it. One sentence changes which of those you have written. ⚠️ THEN ASK WHO BEARS THE COST, because it is very often not the person making the choice. That single question opens up the social and environmental side without any extra theory, and it is where the marks the other boards do not ask for are sitting. ⭐ NOW THE HABIT THAT DECIDES THE TOP BAND, AND IT IS A MARKS ISSUE BEFORE IT IS A FAIR ONE. ⚠️ ATTRIBUTE POSITIONS AND GIVE BOTH SIDES THEIR STRONGEST FORM. Not "this was obviously the wrong decision", which states one view as fact. "Critics argue the same money would have done more good elsewhere, while supporters point out that the alternative benefits only some residents" reports two positions an examiner can see you have weighed. ⚠️ AN EVALUATION THAT DEFEATS A WEAK VERSION OF EITHER SIDE HAS ENGAGED WITH NOTHING. Then reach a judgement, because the command word asks for one. ⚠️ "THERE ARE ARGUMENTS ON BOTH SIDES" IS A DESCRIPTION OF THE QUESTION, NOT AN ANSWER TO IT. Say which considerations you found weightier and why. One last thing that costs marks quietly. ⚠️ DO NOT INVENT FIGURES. A made-up cost or percentage is worth less than no number at all, and this topic never requires one: naming what was given up and who bears it is the specific detail that earns credit.

A field, and four questions

A piece of farmland on the edge of a town is going to be built on. Houses are badly needed. Run the method rather than reaching for an opinion. FIRST: WHAT WAS CHOSEN? Housing on that land. State it plainly, because everything else is measured against it. SECOND: WHAT WAS THE NEXT BEST ALTERNATIVE? ⚠️ THIS IS THE MOVE MOST ANSWERS SKIP, AND IT IS WHERE THE EVALUATION ACTUALLY STARTS. Not "nothing", and not "leaving it empty". The land was producing food, and it could have gone on doing so. ⭐ THAT CROP IS THE OPPORTUNITY COST, AND WITHOUT NAMING IT THERE IS NOTHING ON THE OTHER SIDE OF THE SCALES. THIRD: WHO BEARS THE COST? Not only the landowner, who was paid. The people who would have eaten food grown nearby bear a little of it. Neighbours who valued the open space bear some. ⚠️ AND NONE OF THOSE PEOPLE SIGNED THE CONTRACT, which is exactly why social costs are easy to leave out of an account and hard to leave out of an honest evaluation. FOURTH: DOES THE COST SHOW UP IN MONEY? The land had a price, so part of it does. ⭐ BUT ONCE FARMLAND IS BUILT ON IT DOES NOT COME BACK, AND NOTHING IN THE PRICE RECORDS THAT. That is the sustainability question: the choice is not merely expensive, it is one that cannot be reversed. ⚠️ NOW THE JUDGEMENT, AND NOTICE THE MODULE IS NOT GOING TO MAKE IT FOR YOU. Supporters argue that housing shortages do serious and immediate harm, and that food can be grown elsewhere. Critics argue that land once built on is gone for good, and that the people bearing the cost are not the ones deciding. ⭐ BOTH ARE SERIOUS ARGUMENTS. An answer that weighs them and says which it finds weightier has evaluated; an answer that lists them has not.

Assemble an evaluation that judges

A town spends its transport budget on a new bypass. Build the sentence an examiner is looking for.

Order the moves of an evaluation

Put the steps in order, from being given a decision to reaching a judgement about it.

• State plainly what was chosen
• Name the next best alternative that was given up for it
• Ask who bears the cost, including people who had no say
• Ask whether any of that cost fails to show up in money
• Set the strongest case for the choice against the strongest case against it
• Say which considerations you found weightier, and why

The choices run

Five questions on opportunity cost and judging a decision. Three lives.

Complete the economic choice facts

The condition of there being less of something available than people want is _____. The next best alternative given up when a choice is made is the _____. The problem of deciding what to produce, how to produce it and for whom is _____. Whether something can be continued without using up what it depends on is its _____.

Three evaluations to repair

Three pieces of student writing about economic choices. In each case the mark is in the method, not in which side is taken.

• An answer to "evaluate this decision" describes in detail everything the project will deliver, and concludes it was worthwhile. Nothing in it is inaccurate. Why does it score poorly?
• A student writes that a decision to clear woodland for a factory "cost nothing, because the land was already owned by the company". What needs correcting?
• An answer on a contested decision reads: "This was obviously the wrong choice and anyone can see it." The student may well be right. What is wrong?

Explain how to judge an economic choice

A classmate can define opportunity cost perfectly but writes evaluation answers that only list benefits. Write them an explanation of what the question wants.

• Explain why a list of what a choice achieved is not yet an evaluation of it
• Explain what opportunity cost adds, and why it is defined as the next best alternative rather than any alternative
• Explain why asking who bears the cost matters, using an example of your own
• Explain why some costs never appear in money, and what sustainability adds to the question
• Explain how to write about a decision people disagree about, including why both sides should be given their strongest form
• Finish by explaining why a conclusion is still required, and what makes one better than saying there are arguments on both sides