TANGIBLE BOOK VALUE is different than book value in that it deducts from asset value intangible assets, which are assets that are not hard (e.g., goodwill, patents, capitalized start-up expenses and deferred financing costs).
UNEXPIRED means not having come to an end or been terminated by the passage of time.
POSITIVE ACCOUNTING THEORY is where theorists tend to explain why some accounting practices are more popular than others (e.g., because they increase management compensation). They tend to support their conclusions with inductive theory and empirical evidence as opposed to deductive methods. Generally avoid advocacy of one accounting rule as being better or worse than its alternatives. Positivists are inspired by anecdotal evidence, but anecdotal evidence is never permitted without more rigorous and controlled scientific investigation.
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