文档介绍：2017-3-2 2 What is the GDP? The market value of all final goods and services produced within a country in a given period of time. To understand how the economic is using its scarce resources, economic are interested in studying position of GDP. GDP(Y) posed of four parts: ? Consumption ( C)? Investment ( I)? Government purchases ( G)? Net export ( NX ) Y= C+I+G+ NX ? Consumption : spending by households on goods and services, with the exception of purchases of new housing. bicycle Mobile phone Durable goods Nondurable goods clothing fruit food services education travel ? Investment : spending on capital equipment, inventories, and structures, including household purchases of new housing ? The investment is different from the financial investment. Not the stocks, bonds, and mutual founds, just means purchases of investments goods. Capital equipment building inventory ? Government purchases : spending on goods and services by local, state, and federal government. ? It include the salaries of government workers and spending on publics workers. Not include transfer payment, such as Social security benefits and unemployment insurance benefits