What is indicated by the statement "Bing Crosby's 'White Christmas' is one of the best selling records of all time. You should get your copy now?"

The statement highlights a form of persuasion known as the "Join the Bandwagon Appeal." This type of appeal encourages individuals to adopt a belief or purchase an item based on the idea that many others are doing the same, suggesting that there is a consensus or popular trend that validates their action.

In this case, referencing Bing Crosby's "White Christmas" as one of the best-selling records of all time implies that because it is popular and widely accepted, the listener should also take part by purchasing their own copy. The underlying message is that aligning with popular trends is a desirable action, thus leveraging social proof to influence behavior. This makes the argument compelling, as it plays on the desire to be part of a larger community or to not miss out on something that is regarded as significant.