Final answer:
The typical limitation to a learning curve is that it does not continue forever, learning gained on one product may not be transferable to another product, and cost data may not be available to construct a learning curve.
Step-by-step explanation:
The typical limitation to a learning curve is all of the above. The learning curve does not continue forever, as there is a point of diminishing returns where the rate of learning starts to decrease. Learning gained on one product may not be easily transferred to another product, as different products may require different skills and knowledge. Additionally, cost data may not be available to construct a learning curve, making it difficult to analyze the impact of learning on costs.