In a particular year, 12000 units of a good are sold at $\$ 1$ per unit. In a later year, 14000 units are sold at $\$ 1.20$ per unit.
If consumer tastes have remained constant, what could account for the change between the two years?
1 )
a decrease in the price of raw materials used by producers
an increase in the price of a substitute good
3 )
an increase in the rate of tax imposed on producers
4 )
the formation of a monopoly in the production of the good
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