The provisions of APB Opinion No. 15 were criticized as being arbitrary, too complex, and illogical. Criticisms focused mainly on the requirements for determining whether a convertible security is a common stock equivalent. Under APB Opinion No. 15 a convertible security was considered a common stock equivalent if, at issuance, its yield was less than two-thirds of the corporate bond yield. This requirement did not reflect the likelihood of conversion in dynamic securities market. As a result, changes in market prices subsequent to issuance, which may change the nature of have been classified differently, for common stock equivalency purposes.