 Maier (2012), in his book, What’s So Good About Biodiversity?, criticised Maclaurin and Sterelny’s arguments for biodiversity’s option value. However, this critique may reflect simply a focus on individual elements rather than variety itself. Maier interpreted “option value” as applying, in accord with economics usage, to a given element, resource, or ecosystem service. Any quantification of value, Maier argued, would require estimates of reliability of stock, risk aversion, and willingness to pay—all missing in Maclaurin and Sterelny’s arguments. These views are partly reconciled by recognising that reference to “option value of biodiversity” is a current value of variety itself, and does not have to be interpreted to mean that the actual value of the future benefits is determined. This difference in perspectives also has played a role in debates about whether biodiversity option value has normative standing.