The promotion of industry development , the apparent employment function and service function of tertiary industry are the reasons why tertiary industry has more and more driving function to urbanization . the driving function of urbanization to tertiary industry is becoming apparent because of agglomeration effect of urbanization and the agglomeration characteristic of need for tertiary industry . the cities " agglomeration scale affect the need scale and structure for tertiary industry , thereby affect the scale and structure of tertiary industry 第三产业需求的集聚性和高的收入弹性以及工业化集聚的经济特性解释了第三产业是到工业化发展到一定阶段后成为城市化主导动力；经济结构的进化与第三产业强大的就业效应、服务效应是城市化对第三产业依赖性日益增强的三个主要因素，城市化的集聚效应以及第三产业需求的集聚特性使得城市化对第三产业发展动力作用也日益明显；城市的集聚规模影响第三产业的需求规模和结构，从而影响第三产业的规模与结构。
The study uses a semi log demand function , with per capita consumption as dependent variable and per capita income , price of itself and its substitutes as independent variables , with 1982 - 2000 time series data , to calculate income elasticity and price elasticity of pork , beef , mutton , birds meat , egg , milk and aquatic products , so as to estimate chinese feed demand 本文以1980 2000年的时间序列资料，以人均畜产品消费量为因变量，以人均收入、价格和替代品价格为自变量，采用半对数形式的需求函数，对猪肉、牛羊肉、禽肉、蛋、奶和水产品消费需求的收入弹性和价格弹性进行测算，从而测算我国饲料的需求。
For the reason that the flexibility demand for books is less than 1 , but the flexibility income is more than 1 , so the publishing enterprise will not attend the competition by reducing the books " price but prefer to making up the price to get considerable benefit . in non - price aspect , the essay mainly inspect the propaganda and specialize conduct of publishing 因为出版企业的产品? ?图书的需求弹性小于1 ，而收入弹性大于1 ，因此，出版企业决不会以降低图书价格的手段来参与市场竞争，而宁可涨价以获取可观的经济效益；在非价格行为方面，本文主要考察了出版企业的宣传行为和专业化行为。
Culture and education , other goods is over 1 . second , cross section data analysis of consumption composition of urban and rural households shows that : ( 1 ) mfc of urban households is lower than its in long - term ; ( 2 ) mfc of rural households is lower than that of urban households ; ( 3 ) the income elasticity of rural households on such good as transportation and communication , housing , dressing , culture and education is high , but low on household facilities ; ( 4 ) the response of urban households on an } 7 goods " price is sensitive than that of rural households ; ( 5 ) the changing foods price of urban and rural households can great affect consumption of other goods . chapter six : analysis on consumption function of rural households in jiangxi province 另外，值得注意的是农村居民的居住需求收入弹性大于城镇居民，反映出农村居民对住房投资的偏好仍未改变;第五，对城乡居民价格弹性的分析表明，城镇居民在各大类商品上对价格的反应都要高于农村居民，而农村居民对交通通讯、食品、衣着、文教娱乐等方面的价格变化反应强烈;第六，对互价格弹性的计算表明，城乡居民的食品价格变动后对其他七大类商品需求量的影响最大，说明稳定食品(或农产品)的价格对于提高城乡居民的消费水平是非常重要的。
Therefore , the paper expanded eles , namely , turned the above assumption into the following : all the consumers in the same income level have the identical marginal budget share or the identical marginal propensity to consume when consuming certain goods , but consumers in different income level have not and the paper , by defining and introducing the nominal variable of income level - a variable of the marginal propensity to consume only resulting from the change of consumers " ( rural residents ) income level , with which the standard income level was compared , adopted to expand again the extended eles model , exploited the surveying household data in 2001 by liaoning statistics bureau , caculated ( 1 ) the marginal propensity to consume , real expenditure structure , real propensity to consume and marginal budget share of main consumer goods of rural residents in different income levels ; ( 2 ) the proportion of the basic demand quantity , the basic demand structure , the basic demand of main consumer goods in real expenditure of livelihood consumption ; ( 3 ) the income elasticity of demand , the expenditure elasticity of consumption , the price elasticity of demand and the cross price elasticity of demand of main consumer goods ; finally , came the following conclusions : 1 故本论文采用对扩展的线性支出系统进行再扩展，即将上述假定改为： “对某类消费品的边际预算份额或边际消费倾向，对于同一收入等级的所有消费者均相同，但对于不同收入等级的消费者则有可能不同。 ”并通过定义和在模型中引入收入等级虚变量，借以代表与基准的收入等级相比，消费者(农民)仅仅由于其所处的收入等级变化所导致的边际消费倾向的变化量。本论文采用对扩展的eles模型的再扩展，利用辽宁省统计局农调总队的2001年农村住户调查分户资料(共1890户) ，计算了( 1 )不同收入等级农民对各主要类型消费品的边际消费倾向、实际支出结构、实际消费倾向、边际预算份额； ( 2 )不同收入等级农民对各主要类型消费品的基本需求量、基本需求结构、基本需求占实际生活消费支出比重； ( 3 )不同收入等级农民对各主要类摘要型消费品的需求收入弹性、消费支出弹性、需求自价格弹性、需求的交叉价格弹性。
