To support participants from lower-income countries, the workshop fee is discounted by 15 and 30 percent for those who are coming from mid-income and low-income countries, respectively. To decide on a whether a country is eligible for these discounts, we use the GDP (PPP) per capita as provided by the International Monetary Fund. The current list is based on figures from 2017 and available on Wikipedia. We consider first 30 countries as high-income, next 30 as mid-income and any other country as low-income.

High-income countries
Australia
Austria
Bahrain
Belgium
Brunei
Canada
Denmark
Finland
France
Germany
Hong Kong
Iceland
Ireland
Japan
Kuwait
Luxembourg
Macau
Malta
Netherlands
Norway
Oman
Qatar
San Marino
Saudi Arabia
Singapore
South Korea
Sweden
Switzerland
Taiwan
United Arab Emirates
United Kingdom
United States
Mid-income countries
Antigua and Barbuda
Bahamas, The
Croatia
Cyprus
Czech Republic
Equatorial Guinea
Estonia
Greece
Hungary
Chile
Israel
Italy
Kazakhstan
Latvia
Lithuania
Malaysia
Panama
Poland
Portugal
Puerto Rico
Romania
Russia
Saint Kitts and Nevis
Seychelles
Slovakia
Slovenia
Spain
Trinidad and Tobago
Turkey
Low-income countries
Those not listed as high- or mid-income