1ãå½P=40æ¶ï¼Q=(50-40)^2=100ï¼å½P=20æ¶ï¼Q=(50-20)^2=900
dQ/dP=-2(50-P)
å¼¹æ§å
¬å¼ä¸ºÎµ=-(dQ/Q)/(dP/P)=-(dQ/dP)*(P/Q)
å æ¤ï¼å½P=40æ¶ï¼Îµ=2*(50-40)*(40/100)=8
å½P=20æ¶ï¼Îµ=2*(50-20)*(20/900)=4/3
2ãå½MR=MCæ¶ï¼å©æ¶¦è¾¾å°æ大
ç±æ¡ä»¶å¯å¾ï¼MR=dTR/dQ=30ï¼MC=0.8Q-8
â´30=0.8Q-8
â´Q=47.5ï¼æ¤æ¶å©æ¶¦=30*47.5-0.4*47.5^2+8*47.5-100=802.5
3ãï¼1ï¼å³ä¸ºqd=qsæ¶çä»·æ ¼,å°ä¸¤å¼èç«,å¯å¾ï¼ä»·æ ¼p=2,产éq=460
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