Final answer:
Janet's situation can be classified as latent demand because she wants to attend the Rolling Stones concert but is unable to do so due to the tickets being sold out.
Step-by-step explanation:
Janet's situation can be classified as latent demand because she wants to attend the Rolling Stones concert but is unable to do so due to the tickets being sold out. Latent demand refers to the desire for a good or service that exists but cannot be fulfilled due to various reasons, such as limited availability.