User Experience Stack Exchange is a question and answer site for user experience researchers and experts. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

I have some usability testing that is taking place in several different countries. The overall budget for incentives is set (in £) but dividing this equally between all countries and then converting it to their currency would mean that some countries end up a higher-value reward because of the economy.

Any ideas on how to split this fairly for everyone?

I thought about comparing the price of staple groceries which are hopefully hold a similar value across developed countries. UK data is common knowledge for me but I couldn't find comparable data for countries in Asia and America.

Any help would be much appreciated.

share|improve this question
up vote 4 down vote accepted

It's no formal index, but the Big Mac Index is probably one of the most fair and complete sources for this sort of data. The economist recently published an "adjusted" Big Mac Index to ajust for GDP per person which matches purchasing power a bit better than the classic BMI.

share|improve this answer

You can use the Big Mac Index to compare the purchasing power of different currencies in different countries.

share|improve this answer

If you are using local recruiters - I'd ask them.

Obviously the point of the incentive is to get people to turn up - so you might want to pay more in locations where you can't afford to have to re-run testing if there are no-shows.

share|improve this answer

A lot depends on how technical you want to get. The Big Mac Index is quick and dirty, but not very accurate.

The best bet would be to use the indices from the World Bank's International Comparison Program. the advantage here is that they show data for high middle and low incomes in each country, so you can really compare across your target groups.

share|improve this answer

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.