Charities are using a form of tandem anchoring when they give you guidance on “suggested donations.” If they provide standard options of $100, $50, $30, and “other,” they know they’ll get higher contributions than if the options are $50, $30, $10, and “other.” The $30–100 range is more likely to result in a donation of $30 than giving a suggested range of $10–50, even though $30 is contained within both.
