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[Econ] a econ question,pls help!

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a econ question,pls help!

during summer holidays, more teenagers look for jobs and the unemployment rate usually rises. The unemployment rate increases because
(1) it takes more time for teenagers to search for a job.
(2) teenagers tend to change jobs more frequently.
(3) not all the new job-seekers can get a job.
A.  1,2
B.   1,3
C.    2,3
D.    1,2,3

I would like to ask why 3 is incorrect, can anyone tell me? Many thanks !



   

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cos labor force wil also increase
imagine there r originally 1000ppl in the labor force n 100.of them are unemployed
if there are 100 teenagers joining labor forcen 1of them cannot get the job
the percentage increase in unemployed pop will be only 1%
while that of labor force will be 10%
as % increase of labor force is greater
unemployment rate will decrease instead

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thanks! apart from the above question, i still have one more...

A severe nuclear leakage occured in Japan in 2011. Explain how his would affect the opportunity cost of using nuclear power.



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