Final answer:
Pizza dough is not considered a quick bread, as it is typically leavened with yeast and requires time to rise, unlike pancakes, muffins, and scones, which can be baked immediately using other leavening agents.
Step-by-step explanation:
The student asked which of the following is not a quick bread: pancakes, muffins, pizza dough, and scones. A quick bread is any bread leavened with leavening agents other than yeast or eggs. Quick breads include a variety of baked goods such as muffins, biscuits, scones, pancakes, and quick loaf breads. They are so named because they can be quickly made and baked without the need for the time-consuming fermentation process required by traditional yeast breads.
Pizza dough, on the other hand, is typically a yeast-leavened bread, which means it requires time to rise before baking, making it not a quick bread. This rising process is crucial to develop the pizza dough's texture and flavor. In comparison, muffins, pancakes, and scones can be mixed and baked right away, often using baking powder or baking soda as a leavening agent for an immediate rise.
In terms of productivity, utilizing different sizes of ovens can reflect differences in economies of scale, as seen in the example of Canadian and U.S. workers. However, this concept is separate from the categorization of bread types and does not determine whether a dough is a quick bread or not.