"The spending <b>of</b> foreigners on domestic production is called exports."<br/><br/>I felt that the presence of 'of' in that sentence was rather awkward so I changed it to<br/><br/>"the spending<b> by</b> foreigners on domestic production is called exports."<br/><br/>==&gt;Which one do you prefer between the two? Is it ok to use 'of' in that context?