Why not? Your answer probably has something to do with standard of living.
One measure of standard of living is gross domestic product (GDP). GDP is the total value of all final goods and services produced in a country during a given period. The following table ranks the countries of the world by GDP using the data available from the U.S. Central Intelligence Agency (CIA) in May 2009.
GROSS DOMESTIC PRODUCT in 2008(Purchasing Power Parity) | ||
|---|---|---|
| RANK | COUNTRY | GDP (PPP) |
| 1 | World | $69,490,000,000,000 |
| 2 | European Union | $14,820,000,000,000 |
| 3 | United States | $14,290,000,000,000 |
| 4 | China | $7,800,000,000,000 |
| 5 | Japan | $4,348,000,000,000 |
| 6 | India | $3,267,000,000,000 |
| 7 | Germany | $2,863,000,000,000 |
| 8 | United Kingdom | $2,231,000,000,000 |
| 9 | Russia | $2,225,000,000,000 |
| 10 | France | $2,097,000,000,000 |
| 11 | Brazil | $1,990,000,000,000 |
| 12 | Italy | $1,821,000,000,000 |
| 13 | Mexico | $1,559,000,000,000 |
| 14 | Spain | $1,378,000,000,000 |
| 15 | Canada | $1,307,000,000,000 |
| 16 | Korea, South | $1,278,000,000,000 |
| 17 | Indonesia | $915,900,000,000 |
| 18 | Turkey | $906,500,000,000 |
| 19 | Iran | $842,000,000,000 |
| 20 | Australia | $800,500,000,000 |
| 21 | Taiwan | $738,800,000,000 |
| 22 | Netherlands | $670,200,000,000 |
| 23 | Poland | $667,400,000,000 |
| 24 | Saudi Arabia | $582,800,000,000 |
| 25 | Argentina | $575,600,000,000 |
| 26 | Thailand | $553,400,000,000 |
| 27 | South Africa | $489,700,000,000 |
| 28 | Pakistan | $452,700,000,000 |
| 29 | Egypt | $442,600,000,000 |
| 30 | Colombia | $399,400,000,000 |
| 31 | Belgium | $390,500,000,000 |
| 32 | Malaysia | $386,600,000,000 |
| 33 | Venezuela | $357,900,000,000 |
| 34 | Sweden | $348,600,000,000 |
| 35 | Greece | $343,600,000,000 |
| 36 | Nigeria | $338,100,000,000 |
| 37 | Ukraine | $337,000,000,000 |
| 38 | Austria | $325,000,000,000 |
| 39 | Philippines | $320,600,000,000 |
| 40 | Switzerland | $309,900,000,000 |
| 41 | Hong Kong | $307,600,000,000 |
| 42 | Romania | $271,200,000,000 |
| 43 | Czech Republic | $266,300,000,000 |
| 44 | Norway | $256,500,000,000 |
| 45 | Chile | $245,300,000,000 |
| 46 | Vietnam | $241,800,000,000 |
| 47 | Singapore | $240,000,000,000 |
| 48 | Peru | $238,900,000,000 |
| 49 | Portugal | $237,300,000,000 |
| 50 | Algeria | $235,500,000,000 |
| 51 | Bangladesh | $224,000,000,000 |
| 52 | Hungary | $205,700,000,000 |
| 53 | Denmark | $204,900,000,000 |
| 54 | Israel | $200,700,000,000 |
| 55 | Finland | $195,200,000,000 |
| 56 | Ireland | $191,900,000,000 |
| 57 | United Arab Emirates | $184,600,000,000 |
| 58 | Kazakhstan | $176,900,000,000 |
| 59 | Kuwait | $149,100,000,000 |
| 60 | Morocco | $137,300,000,000 |
| 61 | Slovakia | $119,500,000,000 |
| 62 | New Zealand | $116,600,000,000 |
| 63 | Belarus | $114,100,000,000 |
| 64 | Iraq | $112,800,000,000 |
| 65 | Angola | $110,300,000,000 |
| 66 | Cuba | $108,200,000,000 |
| 67 | Ecuador | $107,100,000,000 |
| 68 | Syria | $95,360,000,000 |
| 69 | Bulgaria | $93,780,000,000 |
| 70 | Sri Lanka | $91,900,000,000 |
| 71 | Libya | $88,860,000,000 |
| 72 | Sudan | $87,270,000,000 |
| 73 | Qatar | $85,350,000,000 |
| 74 | Tunisia | $81,880,000,000 |
| 75 | Serbia | $80,740,000,000 |
| 76 | Dominican Republic | $77,430,000,000 |
| 77 | Azerbaijan | $73,650,000,000 |
| 78 | Croatia | $73,360,000,000 |
| 79 | Uzbekistan | $71,630,000,000 |
| 80 | Puerto Rico | $70,590,000,000 |
| 81 | Guatemala | $68,020,000,000 |
| 82 | Oman | $67,000,000,000 |
| 83 | Ethiopia | $66,290,000,000 |
| 84 | Lithuania | $63,250,000,000 |
| 85 | Kenya | $61,830,000,000 |
| 86 | Slovenia | $59,140,000,000 |
| 87 | Yemen | $55,290,000,000 |
| 88 | Burma | $55,040,000,000 |
| 89 | Tanzania | $54,260,000,000 |
| 90 | Costa Rica | $48,480,000,000 |
| 91 | Lebanon | $44,070,000,000 |
| 92 | El Salvador | $43,940,000,000 |
| 93 | Bolivia | $43,080,000,000 |
| 94 | Cameroon | $42,760,000,000 |
| 95 | Uruguay | $42,460,000,000 |
| 96 | Korea, North | $40,000,000,000 |
| 97 | Luxembourg | $39,420,000,000 |
| 98 | Latvia | $38,980,000,000 |
| 99 | Panama | $38,490,000,000 |
| 100 | Uganda | $35,880,000,000 |
| 101 | Ghana | $34,040,000,000 |
| 102 | Cote d'Ivoire | $34,000,000,000 |
| 103 | Honduras | $33,630,000,000 |
| 104 | Nepal | $31,090,000,000 |
| 105 | Jordan | $30,760,000,000 |
| 106 | Bosnia and Herzegovina | $29,900,000,000 |
| 107 | Turkmenistan | $29,650,000,000 |
| 108 | Paraguay | $28,710,000,000 |
| 109 | Cambodia | $27,950,000,000 |
| 110 | Estonia | $27,720,000,000 |
| 111 | Bahrain | $26,700,000,000 |
| 112 | Botswana | $26,040,000,000 |
| 113 | Trinidad and Tobago | $24,190,000,000 |
| 114 | Afghanistan | $23,030,000,000 |
| 115 | Cyprus | $22,690,000,000 |
| 116 | Senegal | $21,900,000,000 |
| 117 | Albania | $21,820,000,000 |
| 118 | Georgia | $21,600,000,000 |
| 119 | Gabon | $21,440,000,000 |
| 120 | Congo, Democratic Republic of the | $21,050,000,000 |
| 121 | Jamaica | $20,880,000,000 |
| 122 | Madagascar | $20,760,000,000 |
| 123 | Brunei | $20,250,000,000 |
| 124 | Equatorial Guinea | $19,370,000,000 |
| 125 | Mozambique | $18,950,000,000 |
| 126 | Armenia | $18,920,000,000 |
| 127 | Macedonia | $18,520,000,000 |
| 128 | Macau | $18,140,000,000 |
| 129 | Burkina Faso | $17,820,000,000 |
| 130 | Zambia | $17,390,000,000 |
| 131 | Nicaragua | $16,830,000,000 |
| 132 | Chad | $16,260,000,000 |
| 133 | Congo, Republic of the | $15,600,000,000 |
| 134 | Tajikistan | $15,400,000,000 |
| 135 | Mauritius | $15,360,000,000 |
| 136 | Mali | $14,480,000,000 |
| 137 | Laos | $13,990,000,000 |
| 138 | Papua New Guinea | $13,290,000,000 |
| 139 | Benin | $12,840,000,000 |
| 140 | Iceland | $12,150,000,000 |
| 141 | Gaza Strip | $11,950,000,000 |
| 142 | West Bank | $11,950,000,000 |
| 143 | Haiti | $11,590,000,000 |
| 144 | Malawi | $11,560,000,000 |
| 145 | Kyrgyzstan | $11,410,000,000 |
| 146 | Namibia | $11,230,000,000 |
| 147 | Moldova | $10,630,000,000 |
| 148 | Guinea | $10,440,000,000 |
| 149 | Malta | $9,801,000,000 |
| 150 | Niger | $9,784,000,000 |
| 151 | Mongolia | $9,557,000,000 |
| 152 | Rwanda | $9,061,000,000 |
| 153 | Bahamas, The | $8,779,000,000 |
| 154 | Montenegro | $6,600,000,000 |
| 155 | Mauritania | $6,310,000,000 |
| 156 | Swaziland | $5,703,000,000 |
| 157 | Somalia | $5,524,000,000 |
| 158 | Barbados | $5,466,000,000 |
| 159 | Togo | $5,105,000,000 |
| 160 | Jersey | $5,100,000,000 |
| 161 | Kosovo | $5,000,000,000 |
| 162 | French Polynesia | $4,718,000,000 |
| 163 | Bermuda | $4,500,000,000 |
| 164 | Sierra Leone | $4,307,000,000 |
| 165 | Suriname | $4,256,000,000 |
| 166 | Liechtenstein | $4,160,000,000 |
| 167 | Eritrea | $3,946,000,000 |
| 168 | Bhutan | $3,789,000,000 |
| 169 | Andorra | $3,660,000,000 |
| 170 | Fiji | $3,616,000,000 |
| 171 | Lesotho | $3,370,000,000 |
| 172 | Central African Republic | $3,239,000,000 |
| 173 | New Caledonia | $3,158,000,000 |
| 174 | Burundi | $3,103,000,000 |
| 175 | Guyana | $3,010,000,000 |
| 176 | Netherlands Antilles | $2,800,000,000 |
| 177 | Guernsey | $2,742,000,000 |
| 178 | Isle of Man | $2,719,000,000 |
| 179 | Timor-Leste | $2,713,000,000 |
| 180 | Belize | $2,577,000,000 |
| 181 | Guam | $2,500,000,000 |
| 182 | Gambia, The | $2,264,000,000 |
| 183 | Aruba | $2,258,000,000 |
| 184 | Zimbabwe | $1,959,000,000 |
| 185 | Cayman Islands | $1,939,000,000 |
| 186 | Djibouti | $1,889,000,000 |
| 187 | Saint Lucia | $1,801,000,000 |
| 188 | Maldives | $1,738,000,000 |
| 189 | San Marino | $1,662,000,000 |
| 190 | Cape Verde | $1,635,000,000 |
| 191 | Antigua and Barbuda | $1,610,000,000 |
| 192 | Virgin Islands | $1,577,000,000 |
| 193 | Liberia | $1,532,000,000 |
| 194 | Seychelles | $1,473,000,000 |
| 195 | Grenada | $1,211,000,000 |
| 196 | Saint Vincent and the Grenadines | $1,103,000,000 |
| 197 | Greenland | $1,100,000,000 |
| 198 | Solomon Islands | $1,078,000,000 |
| 199 | Gibraltar | $1,066,000,000 |
| 200 | Samoa | $1,057,000,000 |
| 201 | Faroe Islands | $1,000,000,000 |
| 202 | Vanuatu | $983,200,000 |
| 203 | Monaco | $976,300,000 |
| 204 | Mayotte | $953,600,000 |
| 205 | Northern Mariana Islands | $900,000,000 |
| 206 | Western Sahara | $900,000,000 |
| 207 | Guinea-Bissau | $857,000,000 |
| 208 | British Virgin Islands | $853,400,000 |
| 209 | Saint Kitts and Nevis | $784,900,000 |
| 210 | Comoros | $741,400,000 |
| 211 | Dominica | $719,800,000 |
| 212 | American Samoa | $575,300,000 |
| 213 | Tonga | $549,100,000 |
| 214 | Kiribati | $357,400,000 |
| 215 | Sao Tome and Principe | $276,600,000 |
| 216 | Micronesia, Federated States of | $238,100,000 |
| 217 | Turks and Caicos Islands | $216,000,000 |
| 218 | Cook Islands | $183,200,000 |
| 219 | Palau | $164,000,000 |
| 220 | Marshall Islands | $133,500,000 |
| 221 | Anguilla | $108,900,000 |
| 222 | Falkland Islands (Islas Malvinas) | $105,100,000 |
| 223 | Nauru | $60,000,000 |
| 224 | Wallis and Futuna | $60,000,000 |
| 225 | Saint Pierre and Miquelon | $48,300,000 |
| 226 | Montserrat | $29,000,000 |
| 227 | Saint Helena | $18,000,000 |
| 228 | Tuvalu | $14,940,000 |
| 229 | Niue | $10,010,000 |
| 230 | Tokelau | $1,500,000 |
Source: CIA World Factbook, 2008. These calculations were made using the purchasing power parity (PPP) technique. This is designed to make the numbers more comparable by adjusting for differences in the cost of products in different countries.
A note in The World Factbook provides a more detailed explanation:
This entry gives the gross domestic product (GDP) or value of all final goods and services produced within a nation in a given year. A nation's GDP at purchasing power parity (PPP) exchange rates is the sum value of all goods and services produced in the country valued at prices prevailing in the United States. This is the measure most economists prefer when looking at per-capita welfare and when comparing living conditions or use of resources across countries. The measure is difficult to compute, as a US dollar value has to be assigned to all goods and services in the country regardless of whether these goods and services have a direct equivalent in the United States (for example, the value of an ox-cart or non-US military equipment); as a result, PPP estimates for some countries are based on a small and sometimes different set of goods and services. In addition, many countries do not formally participate in the World Bank's PPP project that calculates these measures, so the resulting GDP estimates for these countries may lack precision. For many developing countries, PPP-based GDP measures are multiples of the official exchange rate (OER) measure. The differences between the OER- and PPP-denominated GDP values for most of the wealthy industrialized countries are generally much smaller.
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