What does the affectivity date for a product's price list entry control?

A developer needs to configure a new installation product that will not be charged to customers. The developer creates the product using the installation object type and adds a product code MODEM5G-INST. To simplify configuration, the developer does not configure a price. The developer sets the selling Start Date to 1 month from now.
To test the new product, the developer configures an order in the Cart and selects the default price list. The developer searches the products list, but the new product does not appear.
What is causing this issue?

When viewed in the Price Details window, which of these can be used to detect the adjustments that have been applied to a line item in the cart? (Choose TWO) Note: This question displayed answer options in random order when taking this Test.

If a product varies in price depending on how it is configured, how can a developer inform the user that the pricing will vary?

You apply rule sets rather than individual context rules to products or promotions.