During a certain period, 10 000 units of a normal good are sold at a price of 20 c. During a later period, 12 000 units are sold at a price of 22 c.
What could explain this change?
1 )
a reduction in consumers' incomes
2 )
an increase in the cost of raw materials
an increase in the price of a substitute commodity
4 )
an increase in the productivity of factors of production
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