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In 2007 the average annual pay of a scientist in the UK was £37 290. The average annual pay of a laboratory technician was £26157. 

What could explain this difference in earnings?  

1 ) 

Laboratory technicians have stronger bargaining power than scientists. 

2 ) 

 Laboratory technicians have to work more unsociable hours than scientists. 

3 ) 

The period of training for scientists is longer than that for laboratory technicians. 

4 ) 

The supply of scientists is high relative to demand for their services.

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