I need some help in designing an economics experiment to test the IIA axiom. My understanding of it is if you rank A above B then if you introduce C or D, you must still always rank A above B in any order.

The experiment should be cheap to run and it needs treatment and control variables.

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    $\begingroup$ It's been pretty amply studied. Almost any paper on the en.wikipedia.org/wiki/Decoy_effect is a good example. The most reproducible violations are actually in a lab (rather than real world) setting, so just gather some undergraduates and make them make some fictitious purchases. $\endgroup$ – Fizz May 11 '19 at 5:40

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