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b.america‘s second harvest has found more donors c.america‘s second harvest promotes the development of technology d.hunger is a problem even in the wealthiest country in the world passage three the differences in living standards around the world are vast.in 1993， the average american had an income of about $25，000.in the same year， the average mexican earned $7，000，and the average nigerian earned $l，500. not surprisingly，this large variation in average income is reflected in various measures of the quality of life.changes in living standards over time are also large.in the united states，incomes have historically grown about 2 percent per year （after adjusting for changes in the cost of living）。at this rate，average income doubles every 35 years.in some countries，economic growth has been even more rapid.in japan， for instance，average income has doubled in the past 20 years，and in south korea it has doubled in the past 10 years. what explains these large differences in living standards among countries and over time？ the answer is surprisingly simple.almost all variation in living standards is attributable to differences in countries‘ productivity-that is， the amount of goods and services produced from each hour of a worker’s time. in nations where workers can produce a large quantity of goods and services per unit of time，most people enjoy a high standard of living；in nations where workers are less productive， most people must endure a more meager existence.similarly，the growth rate of a nation‘s productivity determines the growth rate of its average income. the fundamental relationship between productivity and living standards is   |
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