Final answer:
Yes, a firm can increase its unit share while its dollar share decreases by expanding into new markets with lower-priced products.
Step-by-step explanation:
Yes, a firm can increase its unit share while its dollar share decreases. This can be achieved through option D, by expanding into new markets with lower-priced products. By entering new markets with lower-priced products, the firm can attract a larger number of customers and increase its unit share, even though the dollar share may decrease due to the lower prices.