MY day job is teaching introductory economics to about 700 Harvard undergraduates a year. Lately, when people hear that, they often ask how the economic crisis is changing what’s offered in a freshman course.

They’re usually disappointed with my first answer: not as much as you might think. Events have been changing so quickly that we teachers are having trouble keeping up. Syllabuses are often planned months in advance, and textbooks are revised only every few years.

But there is another, more fundamental reason: Despite the enormity of recent events, the principles of economics are largely unchanged. Students still need to learn about the gains from trade, supply and demand, the efficiency properties of market outcomes, and so on. These topics will remain the bread-and-butter of introductory courses.

Nonetheless, the teaching of basic economics will need to change in some subtle ways in response to recent events. Here are four:

THE ROLE OF FINANCIAL INSTITUTIONS Students have always learned that the purpose of the financial system is to direct the resources of savers, who have extra funds they are willing to lend, to investors, who have projects that need financing.