The market for crab sandwiches experiences an increase in the price and an increase in the output of crab sandwiches. Which of thfollowing combinations of events is the only one that could have caused these changes?
1 )
A fall in the price of tuna sandwiches and a fall in the price of crab
2 )
A new tax on food packaging and a fall in labour productivity
A rise in the price of prawn sandwiches and a rise in the price of bread
4 )
New entry of firms into the sandwich market and a reduction in the minimum wage
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