If yoghurt and smoothies are substitutes in consumption, then a rise in the price of yoghurt will cause the: O demand for smoothies to increase. O demand for smoothies to decrease. O supply of smoothies to increase. O supply of smoothies to decrease.A normal good is: O a good for which higher income causes an increase in demand. O a good which is normally purchased by many consumers. O a good which is only purchased by high-income consumers. O a good for which higher income causes a decrease in demand.Paint and paintbrushes are complements. A decrease in the price of paintbrushes will cause the demand for: O paint to increase. O paint to decrease. O paintbrushes to decrease. O both paint and paintbrushes to decrease.An inferior good is O a good whose demand increases when income rises. O a good whose demand decreases when income rises. O an item that is only bought by rich people. O an item that is purchased by very few people