如果要比较各国老百姓的购买力（所谓 养家糊口，日常生活的好坏），用Purchasing power parity per capita（人均购买力平价，人均PPP）是有缺点的。因为Purchasing power parity per capita是GDP的变形，和GDP一样包含消费，投资，政府支出和进出口这4大项。而各国GDP中，消费这项占的比例是不同的。例如：消费占美国的GDP70%，而中国的GDP中消费的比例50%多一点。如果两国的Purchasing power parity per capita相等，美国老百姓实际上还是多买了20%多的东西。因此，Purchasing power parity per capita适合在宏观层面上，比较各国的人均DGP（经用购买力校正后）和国人的宏观生活（除了消费外还包括国防等政府的服务，公司的投资等等）状态。cost of living index 只和日常生活花费有关，因此，用cost of living index 和 各国的平均工资接合起来比用Purchasing power parity per capita更能反映各国老百姓的生活（衣食住行，教育等等）水准。
具体到底选哪个，取决于比较者的目的。
下链接是140个国家的cost of living 的列表， 和地图
http://www.nationmaster.com/country-info/stats/Cost-of-living/Local-purchasing-power
下链接是各国的月平均可支配工资
http://www.nationmaster.com/country-info/stats/Cost-of-living/Average-monthly-disposable-salary/After-tax
下链接是各国的Purchasing power parity per capita
http://www.nationmaster.com/country-info/stats/Economy/GDP/Purchasing-power-parity-per-capita
Cost of Living Index
The costs of consumer goods and services vary between different urban and suburban residential areas. Cost of living indexes are meant to compare the expenses an average person can expect to incur to acquire food, shelter, transportation, energy, clothing, education, healthcare, child care and entertainment in a given region. Another way to interpret what a cost of living index represents is to ask the question: "How much local goods and services does a given some of money purchase?" For instance, $100 tends to purchase more goods and services in Denver than it does in New York City.
Purchasing power parity per capita - DEFINITION: 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 difference between the OER- and PPP-denominated GDP values for most of the weathly industrialized countries are generally much smaller. Figures expressed per capita for the same year.
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