Principles of Macroeconomics / Unit 16 MAC 1518 review, 2 to 3 minutes
The Four Goals as Four Coordination Failures
The idea
The anchor closes this chapter with a frame worth carrying into the capstone, because it makes the course's four goals into one idea. Each of them, looked at closely, is a failure of coordination between parties who would both gain from meeting. Cyclical unemployment is aggregate demand meeting aggregate supply below potential: willing workers and willing employers exist, and the spending that would connect them is missing. Natural-rate unemployment is a different failure between the same two parties: the willing worker and the willing employer both exist and the rules or the information between them prevent the match. Inflation is demand outstripping what an economy can supply, so the price level does the rationing. And a trade imbalance is domestic saving out of line with domestic investment, with the gap made up abroad. Naming which failure a country has is the diagnosis, and every model in this course is a tool for making that naming precise.
In practice
Worked example, one country diagnosed four ways. Unemployment is high and has risen in the last two years while output fell: cyclical, so demand policy and the automatic stabilisers apply. Unemployment is high and has been high for twenty years through expansions too: natural rate, so the instruments are training, job matching and the design of employment rules, and demand policy will not touch it. Prices are rising at forty percent a year while the budget deficit is financed by the central bank: a monetary failure with a fiscal cause, and the remedy is fiscal before monetary. The current account deficit is nine percent of output and financed by short-term foreign money: a saving-investment imbalance carrying the exposure unit thirteen described. Four different answers, four different instruments, and the same four models throughout.
Where people slip
Three cautions. First, most real countries have more than one of these at once, and the instruments can conflict — demand policy that treats the cyclical problem does nothing for the structural one and may worsen the monetary one. Second, on foreign aid the course reports a genuine disagreement rather than a conclusion: the case for it points to clinics, schools, water, power and roads that would not otherwise be built; the case against holds that aid is captured by those who control it, displaces other investment, and follows the giver's politics rather than the recipient's need; and the point both sides concede is that aid tied to specific long-term investment has a modest role, while the sums involved are small for giver and receiver alike. Third, the diagnosis is not the prescription. This unit names which failure an economy has and stops there, because deciding what a country should do about it involves judgements about who bears the cost that no model in this course can make.
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