For an effective symbolic act (Kinyan) that creates a binding marriage agreement of Kiddushin, is an appraisal of the consideration necessary? \u2022 Why was Rav Kahana able to effect the redemption of the firstborn? \u2022 Sliding scale values: an object can be worth more than the market value to some individuals \u2022 Discerning through context the acceptance or rejection of a suitor