Sentence:  A successful businessman recently prefaced his address to a luncheon group with the statement that all economists should be sent to the hospitals for the mentally deranged where they and their <WSD>theories</WSD> might rot together . 
Meaning of the word marked with <WSD> tags:  a well-substantiated explanation of some aspect of the natural world; an organized system of accepted knowledge that applies in a variety of circumstances to explain a specific set of phenomena