\begin{tabular}{l}\( \begin{array}{l}\text { Lukas owns a bookstore. He currently sells 1,200 books per year. If he } \\ \text { doubles the size of his store so he can sell 2,400 books per year and } \\ \text { his tong-run average total cost per book decreases, we know that } \\ \text { Lukas is experiencing _- } \\ \text { OA) diseconomies of scale. } \\ \text { OB) economies of scale. } \\ \text { OC) constant returns to scale. }\end{array} \) \\ \hline\end{tabular}

By doubling the size of his store and increasing his sales from 1,200 to 2,400 books per year while also experiencing a decrease in his long-run average total cost per book, Lukas is tapping into the magic of growth! This kind of scenario reflects economies of scale: as production increases, the cost per unit typically decreases due to more efficient use of resources and spreading fixed costs over a larger number of goods. In the big picture of running a bookstore, these efficiencies can lead to bigger profit margins, allowing Lukas to potentially invest in better marketing, comfortable reading spaces, or exciting community events aimed at book-lovers. It's a win-win for both his wallet and his clientele!