Sentence:  You must remember that it takes two to make a bargain. On your side you look through a telescope so that it will magnify the value of your holdings, while the buyer, on the contrary, looks through the reverse end of the instrument so as to <WSD>diminutize</WSD> it as much as possible. 
Meaning of the word marked with <WSD> tags:  To make (someone or something) appear smaller ("often in a figurative sense").