大学初级微观经济学9.If it costs $30 to produce the first unit of a good and $28,$27,$25,$23,$24,and $25 to produce the next six units,respectively,then the minimum of the average cost curve could occur at:\x05A)\x051 unit.\x05B)\x052 units.\

大学初级微观经济学9.If it costs $30 to produce the first unit of a good and $28,$27,$25,$23,$24,and $25 to produce the next six units,respectively,then the minimum of the average cost curve could occur at:\x05A)\x051 unit.\x05B)\x052 units.\
大学初级微观经济学
9.If it costs $30 to produce the first unit of a good and $28,$27,$25,$23,$24,and $25 to produce the next six units,respectively,then the minimum of the average cost curve could occur at:
\x05A)\x051 unit.
\x05B)\x052 units.
\x05C)\x053 units.
\x05D)\x055 units.
\x05E)\x05none of the above.

大学初级微观经济学9.If it costs $30 to produce the first unit of a good and $28,$27,$25,$23,$24,and $25 to produce the next six units,respectively,then the minimum of the average cost curve could occur at:\x05A)\x051 unit.\x05B)\x052 units.\
选E,none of the above.边际成本曲线应该在上升阶段（右半边）交于平均成本曲线的最低点,边际成本曲线的最低点在5 units($23),所以平均成本曲线的最低点应该是5 units之后的某一个点.实际上,你可以算出这七个单位产品的平均成本是26,所以平均成本曲线的最低点应该是在第七个单位之后.