Intro to Econ: Sixth Lecture – A supply and demand classroom experiment

My students have played a short supply and demand experiment in class this year. The experimental design goes back to the work of Chamberlin (1948, JPE) and Vernon Smith (1962, JPE). I have used the beautiful online design developed by Heinrich Nax, Diego Gabriel Nunez Duran, and Bary Pradelski at the ETH Zürich. I ran three sessions and had 60 students participating in each. I am afraid I did not pay any money, so if you are interested in the experiment you may want to go back to the original Vernon Smith (1962) experiments and the literature that followed, in which subjects are almost always given (some) monetary incentives. The results I got with my students were not that different, however, to what researchers found with monetarily incentivized students.

Continue reading


Intro to Econ: Sixth Lecture – When Air Berlin went out of business

This is to demonstrate the usefulness of the ideas from the last post. When Air Berlin went out of business in 2017 the prices for Lufthansa flights increased substantially (up to 30%). I have this from a news article from the ORF from the 26th of November 2017. Lufthansa, according to this article, claimed that this has nothing to do with them, it is simply a question of an increase of demand and as a consequence that their automated ticket booking system simply more quickly leads to higher price categories. Apparently Lufthansa uses up to 26 price categories (for the same seats). Which category you get depends on when you book your ticket and how full the plane is already and possibly some other things. This is actually a topic for another class – on price discrimination. But let me here only explain in which sense Lufthansa’s statement is right and wrong at the same time, or at the least on how one should perhaps read their statement.

Continue reading

Intro to Econ: Sixth Lecture – From market demand to demand for a particular producer

One should differentiate between the demand for a good generally and the demand for a good from a particular producer. Think about the market for holiday apartments in Upper Styria (at some time of the year). As we discussed before we would expect that the demanded number of apartments will depend on the price of these apartments, the lower the price the more people would be interested in renting a holiday apartment. I don’t quite know what the slope (or shape) of this demand function is exactly, but we would expect to be properly downward sloping (as a function of the price).

Continue reading

Auch österreichische Pärchen und Studierende reagieren auf Anreize

Statistik Austria hat anlässlich des 100. Jubiläums der Republik Österreich eine Zusammenstellung von interessanten Statistiken veröffentlicht. Unter den Highlights:


Man beachte die Ausreißer rund um Änderungen in der steuerlichen Behandlung von Ehepaaren in der Zeitreihe. Fazit: Österreichische Pärchen reagieren auf monetäre Anreize. Keine Überraschung für Ökonomen, aber immer wieder schön zu sehen.

Dasselbe gilt auch für Studierende:

Bildschirmfoto 2018-11-28 um 23.34.49

Man beachte den Knick nach unten bei Wiedereinführung der Studiengebühren 2001 und den Knick nach oben bei der (De-Facto-)Abschaffung derselben ein paar Jahre später.

Die ganze Präsentation ist äußerst lesenswert!




Intro to Econ: Sixth Lecture – What is driving changes in prices?

Suppose you observe different prices for the same good at different times. Why would that be? How can we explain this? In fact there are lots of possible explanations for this, but they can mostly be grouped into two categories of explanations: explanations based on changes of the demand(function) for the good and explanations based on changes of the supply(function) for the good. [Another explanation could be that there are changes in the market structure, which is a point I will get to in a later lecture.] Let me give you what I believe are good examples for the two cases. First, Styrian white wine in different years. Second, Upper Styrian hotel rooms and apartments in winter versus summer.

Continue reading

Intro to Econ: Fifth Lecture – Student Accommodation

Many university towns have problems with affordable student accommodation. In Graz things are not too bad, I think, but I guess things could also be better. Let me make the following policy proposal and let’s discuss whether we think this is a good idea. I suggest a law that states that students who rent an apartment or a room are not allowed to be charged more than €2 per square meter. At the moment gross rent prices in Graz are probably around €10 per square meter (if not more). Do you think this policy would have the desired effect?

Continue reading