I have figured out that the statistics in the beginning of this thread is somewhat irrelevant for most of us. Many of the billionaires in the world have been billionaires for a long time, but it is not that interesting for aspiring billionaires to know where it was easy to become billionaires a long time ago. We want to know where it is easiest to become billionaires today, so the most relevant statistics is the billionaire production rate. I think the following formula is a good estimation for the current billionaire production rate for different countries:
Billionaire production rate = (Billionaires in 2004 Billionaires in 1996) / (Population 2004)
The list of countries where the number of billionaires has increased the last 8 years is as follows:
Country, Billionaire production 1996-2004 (excluding immigration) per million citizens
1. Norway, 0,87
2. United Arab Emirates, 0,57
3. Kuwait, 0,50
4. United States of America, 0,46
5. Austria, 0,37
6. Canada, 0,34
7. Republic of Ireland, 0,26
8. Singapore, 0,24
9. Sweden, 0,22
10. Australia, 0,20
11. Portugal, 0,19
12. Denmark, 0,19
13. Russia, 0,17
14. Israel, 0,15
15. Republic of China (Taiwan), 0,13
16. United Kingdom, 0,12
17. Spain, 0,12
18. Italy, 0,10
19. Belgium, 0,10
20. Saudi Arabia, 0,041
21. Turkey, 0,029
22. India, 0,005
23. People's republic of China, 0,0008
Apparently the last 8 years Norway has been the best country to become a billionaire in. Two of the four Norwegian new billionaires have made their fortune on shipping, so the easiest way to become a billionaire is obviously to move to Norway and invest in shipping

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Unfortunately Forbes list did not include the citizenship of the billionaires in 1996, so I couldnt remove the migrated billionaires from the 1996 numbers. I have removed them from the 2004 numbers though. This is quite fair for most countries, but for Switzerland it seems to be somewhat unfair. Switzerland is the only country who has a large population of domestic billionaires, but also an even larger population of immigrated billionaires. Since I included immigrated billionaires in the 1996 numbers but not in the 2004 numbers, Switzerland ended up having a declining billionaire population over this period. If immigrated billionaires where counted both in the 1996 numbers and the 2004 numbers the list would be as follows:
Country, Billionaire production 1996-2004(including immigration) per million citizens
1. Monaco 129
2. Bahamas 3,3
3. Switzerland, 0,96
4. Norway, 0,87
5. United Arab Emirates, 0,57
6. Kuwait, 0,50
7. Austria, 0,49
8. United States of America, 0,48
9. Singapore, 0,48
10. Canada, 0,37
11. Republic of Ireland, 0,26
12. United Kingdom, 0,22
13. Sweden, 0,22
14. Australia, 0,20
15. Belgium, 0,19
16. Portugal, 0,19
17. Denmark, 0,19
18. Russia, 0,17
19. Israel, 0,15
20. Republic of China (Taiwan), 0,13
21. Spain, 0,12
22. Italy, 0,10
23. Saudi Arabia, 0,041
24. Turkey, 0,029
25. India, 0,005
26. People's republic of China, 0,0008
The high rate of increase of billionaires in the three highest ranking countries is mainly due to immigration. Monaco and Bahamas have not fostered any billionaires. All their billionaires are immigrants who made their fortune from somewhere else, and 13 of the 20 billionaires in Switzerland are foreigners who made their fortune from a different country.
None of the Norwegian billionaires are immigrants, so Norway is undoubtly the best country to live in when you make your first billion

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Drunk Master said:
Hmmm Where is Monaco on that list?
I always thought that was a tax paradise for the rich.
Monaco has not fostered any billionaires. All the billionaires who live there are foreigners who made their fortune from a different country. I did not count such traitors when I made the list.
RealGoober said:
Canada: 0.5. Oh ya! Our Socialist Government has yet to push all of our Billionaires elsewhere because of our high taxes.
Actually only one Canadian billionaire has left your country. Canada has also attracted one foreign billionaire, so it seems like billionaires are quite content with the tax level over there

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Sims2789 said:
I'm willing to bet that the only billionaire is the Prince, since they only have 13,000-odd people. Maybe they have a few more, but I wouldn't be suprised if he's the only one.
You are right that there is only one billionaire in Liechtenstein, but I dont think it is the prince. Royals dont count in Forbes lists, only private billionaires.