When there is a decrease in equilibrium quantity and indeterminate change in equilibrium price. this is likely as a result of b. A decrease in supply and increase in demand.
When there is a decrease in supply, the result would be that the supply curve would shift to the left to show that the equilibrium quantity has been decreased.
If there happens to be an increase in demand at the exact same time, then the demand curve would shift right. The result would be that there would be an indeterminate change in equilibrium price.
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