大学微观经济学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)\

大学微观经济学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)\
大学微观经济学
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)\
选E,题目大概意思是如果生产一单位产品成本,每增加一单位,依次是30,28,27,25,23,24,25,然后请问生产几个产品平均成本最小.开始的第一单位成本30是包括固定成本在内,是边际成本加固定成本,所以成本很大,然后接下来成本递减,然后遵循边际成本递增原则,在成本达到23时,边际成本最小,随后开始递增,而平均成本由于含有固定成本部分,所以开始递增要晚与边际成本,即平均成本的最低点要比边际成本出现的晚.经过计算当是23时,即五件时,虽然边际成本最低,但是平均成本26.6,第六件时只有26.1,第七件时只有26,因此第七单位时最小平均成本,答案里没有.