This paper formalizes a two-step representation of accounting measurement and uses it to formalize a general rationale for conservatism as a measurement principle. A transaction's economic substance manifests itself in characteristics of the transaction, and an accounting rule is a mapping from transaction characteristics to an accounting report. Managers who have stakes in the accounting report are able to influence transaction characteristics. Such earnings management is ex post rational for managers but ex ante inefficient. To safeguard against such ex post opportunism, the optimal ex ante accounting rule is conservative in the sense that it requires more verification of the transaction characteristics favorable to managers. Thus, this rationale for conservatism is as general as the managers' ability and incentive to inflate transaction characteristics. By opening the black box of accounting measurement, the two-step representation also formalizes some classic accounting concepts, such as relevance, reliability, verifiability, verification, and accounting-motivated transactions.

ABSTRACT Faceless trading in a secondary stock market not only redistributes wealth among investors but also generates information that feeds back to real decisions. Using this observation we re‐evaluate the “leveling‐the‐playing‐field” rationale for disclosure to secondary stock markets. By partially preempting traders' information advantage established from information acquisition, disclosure reduces private incentives to acquire information, resulting in two opposite effects on firm value. On one hand, this narrows the information gap between informed and uninformed traders and improves liquidity of firm shares. On the other hand, this reduces the informational feedback from the stock market to real decisions. This tradeoff determines the optimal disclosure policy. The model explains why firm value can be higher in an environment that simultaneously promotes disclosure and private information production and why growth firms are endogenously more opaque than value firms.