An auction puts a price on things through competition. Dream books read it as questions of worth — what you would bid for, and whether you feel your own value is being set by others.
Where in your waking life have you met something like this lately?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.