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In 2002 it was proposed that car owners should pay a charge to travel into the centre of London. Fares on public transport would also be reduced. It was hoped that more use would be made of public transport and that congestion would decrease. 
What price elasticities of demand would be necessary for this policy to succeed?

1 ) 

A

2 ) 

B

3 ) 

C

4 ) 

D

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