Archive for December, 2009

Suppose I go into a sandwich shop and they have two choices on the menu: bacon or avocado. Faced with this choice, I choose avocado. When the waiter arrives, however, he tells me that cheese is also available. I choose bacon.

Michael Allingham in his little book “Choice Theory: A Very Short Introduction” says that there is “something untoward in your pattern of choices”. The implication here is that such a choice is irrational given my previous preference for avocado. Adding another alternative should not, we might suppose, affect my decision if I don’t want the new alternative.



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