Final answer:
The consideration overlooked by a firm lacking export experience and using cost-based pricing is market demand.
Step-by-step explanation:
The consideration overlooked by a firm that lacks substantial export experience and employs the rigid cost-based pricing method is market demand. Market demand refers to the level of consumer interest and willingness to pay for a product or service in a particular market. It is important for a firm to understand market demand when setting prices, as it directly affects the firm's sales and profitability.